#it's like saying voldemort

[stolenviolet]

May I humbly request more dad Voldemort with Death/Thomas, please? 🙏

You may~

[iamnmbr3]

Tom Riddle: I don't like having a first name that's so common. There are a lot of Toms.

Sorting Hat: No problem! I’ll put you in Slytherin. No Toms there... Because they’re all old blood purist families named after stars and things. Also they’ll hate you. Have fun sticking out and being immediately identifiable as everything they despise due to your unusual Muggle name. :)

[bitesizedgummie]

ah yes, He

He is definitely rubbing off on you, miles

care to say His name?

[odillisea]

I keep seeing people talking about how Dorcas was killed by Voldemort himself and completely misinterpreting it as “she was so strong and powerful that only he could kill her,” which might’ve been what happened, but I feel like probably wasn’t the case seeing as he’s killed plenty of random people throughout the series and she was only really mentioned that one time.

But there could’ve been some other reason as well, rather than “oh yeah she was just really really powerful.” What if the reason Voldemort targeted Dorcas was because she kept talking to her old friends from Slytherin and making them question their loyalties and whatnot, and had even managed to make a few death eaters drop out of the war? Sure, she was a dangerous enemy to have, but what if another layer of that danger for Voldemort’s side was her way with words?

Imagine Dorcas fighting in the war and seeing her old classmates that she quite literally lived with for seven years fighting against her. Imagine Pandora telling her the reason why she couldn’t bring herself to join the order, despite how much she wanted to help, was because she couldn’t make herself do anything to hurt Evan. Imagine her continuing to fight with all her strength, but then tracking down the death eaters she knew from school just to see if she could talk them out of it.

Evan and Barty stayed, of course. They were loyal to Voldemort till the end but they would always leave her, one of the order’s best duellists, completely unscathed. But others would listen to her, growing more uncertain and starting to hold back more or try to leave the death eaters completely. She was a Slytherin after all. She would’ve had both the ambition and drive to find these death eaters individually, and the cunning in her words to make them question their loyalties.

Maybe Voldemort went after her after Regulus died, because he thought she had something to do with him betraying him, and maybe she actually did. Maybe she had talked to him, even if it was Kreacher that was the turning point, and he had to kill her himself because she could genuinely make them lose the war if she kept doing what she was doing. Maybe the power she had that Voldemort feared so much was the power to turn his own forces on him. The power to destroy his forces without a single weapon or wand.

[theinvisiblemuseum]

canon regulus was nawt the hardcore murderous genius most of yall make him out to be he was just a nepo baby with a crush on the hot older guy who always came over to his parents house

[short666bread]

Get Haunted

[sk1fanfiction]

blood of the covenant/water of the womb

The Black sisters are so tragic.

I mean, imagine:

As kids, Narcissa is the baby sister that the elder two dote on, while both Narcissa and Andromeda look up to Bellatrix, the proud, beautiful, powerful, accomplished, perfect eldest sister, who has always known who she is and where she's going, but especially Andromeda, since they look so alike she's always been encouraged to act like her too but since Narcissa doesn't have the stereotypical Black looks and her parents didn't follow the Black naming scheme she's encouraged to be her own person a little bit more.

At Hogwarts they're all Sorted into the same House, Slytherin, which only increases their bond. Bella does really well at school, probably the top of her class, which makes Andy, who's only a year or two behind hyperaware of where the bar is. She walks, talks, and dresses like Bella.

Until

Andy follows in Bella's footsteps (who's probably Head Girl by now) and becomes a prefect, but she gets assigned to do rounds with a Muggle-born Hufflepuff. And despite everything she'd been taught, everything she knows to be true, she finds herself falling for him and the worst part is she can't tell anyone, even Bella, the one she has always been able to confide in, always reassured her and set her on the right path.

Meanwhile Druella and Cygnus are arranging Bellatrix's marriage to Roldophus, someone she doesn't even like never mind attracted to but because she's the perfect Black and the perfect daughter she has to do it. And Andromeda sees and fears how she could get trapped, too, how there's another Lestrange boy in her year.

Meanwhile a strange foreign Dark Lord comes to dinner and he's so different to Roldophus and all those other men who think because she's a woman she must be weak and she's just a vessel for their pureblood children. And despite the way she shouldn't feel this way, Bella doesn't care. He listens to Bella's opinions and he takes her seriously and he sees her magical talent and her thirst to prove herself and he's not scared of her in the way others say that she's 'too intense.' And when he offers to train her, and adds that he never does this, she says, one better, I'll follow you.

Andromeda and Narcissa watch this strange man burn the Dark Mark into their sister's arm and they don't know what to think. Narcissa's scared Bella will put herself in danger, that she'll do too much, give too much of herself because she doesn't know when to pull back. And Andy's scared Bella's going down a path she cannot follow, because deep down she can't say she believes in blood supremacy, can't say she hates Ted and she can't figure out a way through so she leaves.

It's like part of Bella's heart has been ripped out. They were all close, the Blacks, but Andy and Bella had a certain je ne sais quoi, they were thick as thieves and inseparable. Bellatrix is the one who burns Andromeda off the tapestry, crying while she does it, the scorned love for her sister, the anger and shame that Andy chose that Mudblood over her turning that love to bottomless hate.

Meanwhile Narcissa, the lucky one, watches it all. Narcissa is the one that gets it all, she's the only one who's able to marry for love and stay with her family but there's also this Andromeda-shaped hole in her and there's a Slytherin resentfulness of being Bellatrix's supporting act.

Every night that Bella is on a mission, Narcissa stays up, even while pregnant with Draco, until she knows her sister is safe.

That fateful Halloween she waits and waits and waits but Bellatrix never comes home. When she finds out her last remaining sister is serving life she completely breaks down. Won't sleep, won't eat. The thought of leaving Draco without a mother is the only thing that helps her hold on. Regulus, Andromeda and Sirius are dead/burned off the tapestry/imprisoned; she and Draco are the last Blacks, that makes their bond even stronger, makes her scared of losing him like she did her sisters. She curses Voldemort for putting her in danger, aware of her feelings for him and that Bella would do anything for them, swears she'll never let that happen to her son.

All the while Andy raises her daughter, who hates the name she gave her in the same way Andy know she would hate the Blacks. Narcissa and Andy watch each other from across crowds; Tonks and Draco are never at school together, never know more than scattered off-hand mentions of a cousin on their mother's side. But both Narcissa and Andy fantasize of a reconcilation, of Tonks babysitting Draco while they rekindle their bond. Neither bridges the gap. That burn, that rift cannot be healed. But they still ache for each other.

When Voldemort returns that fear for Draco grows, but it's tempered with the joy of having Bella back after mourning her for 14 years -- Bella, traumatized, starved, jagged and torn up at the edges, different, but alive.

And just like knowing he was innocent kept Sirius sane, Bella's love and trust of Voldemort is what made her able to hang on. Yes, they're both drastically different physically (the snake face and the emaciation) and mentally (both shaken, less confident), but everything else can be the same. Maybe better.

But everyone is scared. It's not the same world, where the Death Eaters have control and are undefeated. Voldemort is scared of that boy, Narcissa is scared for Draco. It's clear things are not the same, things are not normal. Far from it. Fear makes Voldemort angry, and cold, and distant and nothing she does feels good enough.

And that boy -- lying hateful filthy boy -- he dares suggest that her Voldemort's filthy-blooded like him. No, he must just be taunting her, scaring her. But there are things Voldemort's said, things he's done -- she would notice, the way she hangs on every word he speaks and plays their conversations in her head over and over again in Azkaban -- Bellatrix just does her best to silence it and block it out, all these confusing things, she's a great Occlumens after all.

She'll make things certain, make things right, trim off the weakness, cut out the sickness. Like Sirius. Like that young woman with Andromeda's face and Andromeda's laugh, that filthy half-blood Andy left her to create.

Narcissa can't keep Draco safe like she, the baby sister, couldn't keep Bellatrix safe. When Voldemort burns the Dark Mark into his skin she sees her son emaciated and dead-eyed.

To assuage Narcissa's fears Bellatrix trains Draco like Voldemort trained her; but he's not the same, he's weak, he's moralistic, he looks at her with wide scared eyes and he's a failure. The glory of the Blacks is gone.

All the while, Narcissa's fear grows, when Lucius is imprisoned, when Voldemort's ire turns on her family, on her son, sets him an impossible task. The despair she feels, she hasn't felt for nearly sixteen years -- Bellatrix more interested in eking out morsels of approval from Voldemort and turning her frustration on Draco, and Narcissa by extension.

All the while, Andromeda's fear for her daughter grows, of the danger she puts herself in as an Auror and a member of the Order, and she's reminded of Bellatrix, of how she gives everything of herself and how Nymphadora does too, begging, begging her to hold back.

She's not good enough for him, not with the sickness, the weakness still clinging to her. Bellatrix very much wants to kill the woman with Andy's face. She's always been perfect. It's everyone else around her that's wrong, everyone else who has to go. She'll do better. Try harder.

And when the Snatchers catch that filthy boy, and he slides out of her grasp like a buttered eel, Bellatrix hits the bottom rung of the ladder of despair. She doesn't know who she is, anymore.

Voldemort's retaliation and rejection breaks Bellatrix's heart, but it hardens Narcissa's.

Bellatrix will do anything to make him happy. She finally kills the witch with Andy's face -- do you see -- do you love me now -- but he's still cold, still frightened, still different, and she despairs, but it will be all over when Harry Potter is dead and he can breathe again. They've won. It will be alright. It will go back to normal. She can have it all again -- Voldemort and Narcissa and her perfect, pruned family.

Narcissa will do anything to keep him safe. And so she chooses Draco's life, she lies, her heart in her throat, in front of her beloved sister, to the Dark Lord, with unshed tears in her eyes and Harry Potter's 'corpse' before her.

Bellatrix's death is something Narcissa knew was coming, deep down She mourned her sister sixteen years ago and she mourns her now, but it will all be worth it if Draco survives this ordeal; Potter must win, he must live, Voldemort must die. And Bellatrix will never allow this.

She wishes she could tell Andy that she understands.

[pandorasopenedbox3]

I’m not sure if someone’s said this before but I’ve always felt that Regulus could’ve very possibly been groomed as a child (And many other children that joined the death eaters upon adulthood).

Can you imagine Riddle visiting the Black’s when Sirius and Regulus were young to gain support. Can you imagine him targeting not the adults of the house but the children that were going to inherit it in probably less than a decade. Can you imagine little 10 year old Regulus Black, who’s advanced at magic and often quiet in contrast to his older brother who fights back. Imagine how Riddle would see this impressionable but powerful child from one of the greatest pure blood families in the UK and immediately seize that opportunity. Especially after Sirius starts at Hogwarts and Regulus is stuck there scared and alone. Riddle showing up randomly to play with him or take him for ice cream or whatever Regulus wanted. Him pretending to care and listen to Regulus and Regulus finally feeling like someone loves him. Seeing a second preferred father in Riddle.

When Regulus starts school he writes to him sharing everything and Riddle writes back short replies and keeps an eye on him. Regulus and Sirius starting to fight because of their family’s ideals. Riddle starts planting doubt in regulus’ mind about how much Sirius truly loves him, picking James over him etc.

The years go on, Riddle is the one there when Sirius leaves. Regulus beleives every word he says bc he truly thinks he’s the only person to have ever truly cared about him.

Regulus starts getting scared by the war. He doesn’t want to kill people, he knows it’s wrong, but when someone you idolize is constantly putting in your head that this is the right thing and those people are actually hurting you then you start to believe them.

The thing with manipulators tho, is they tend to get paranoid. Regulus starts getting really close with Dorcas Meadows who is a blood traitor. Riddle makes him take the dark mark. Oh his best friend Pandora Rosier leaves her pure blood family to get away from the war. Forces him on his first mission and to physically kill a civilian which Reg has protested against adamantly. His one thing is he didn’t want to have to kill someone. He starts using all these threats on Reg, but he does it slowly enough that he doesn’t notice. Still Reg is beginning to get cautious around him and go behind his back (as teenagers do, he still sees Riddle as this person who loves him so he’s not necessarily afraid but he starts to fight back little by little)

But oh the kicker is when Reg stays friends with Pandora, behind his back. Oh now this time Riddle takes Kreature. And that just happened to be one step too far.

Imagine 17 year old Regulus lending his beloved house elf out to his mentor, his idol, his father figure and expecting for him to treat this person regulus loves more than anything well and send him home safely only to find out how awful that person is. Imagine Regulus sobbing on his bedroom floor because nothing he thought was true in the last 7 years were real. Riddle never cared about him, he was a weapon, a thing to be controlled. Finding out everything he was taught was a lie and wrong and he should’ve just trusted his gut god damn it and left with Dorcas and Pandora. Imagine regulus realizing his brother was right all along and he loved something that would never give him anything real back. Imagine Regulus Black putting all of his hatred and spite into killing the man that had ruined his life. Imagine him signing that letter knowing Riddle was the one who taught him how.

I could say so much more about this situation and how much it hurt him. And now I’m just sad for that poor lil boy. They were children.

[casquecest]

In another world where Harry opened the mirror, Saturday nights are all right for ranting.

[color-ns]

Hey… @isalisewrites … I finished it… woooo…!

(I did NOT mean to post this right after the new chapter was out lmao)

For anyone interested, this is from Alysium’s Sanctuary chapter 6 and it’s SO GOOD go read it, you will not regret this.

[animefanboy48]

I just realised that the reason Tom Riddle wanted to be a DADA teacher because H¡tIer tried to be accepted at an ARTS school but failed.

That so obvious but I never thought about it;-;

[greenerteacups]

Hi GT! Congratulations on the last chapter, as always! Lately my brain has been fixated on a detail that I find very interesting. I can't help but think that any adult in LH who is preparing for war has at least once thought while looking at Draco "ok, this could definitely help us in the future". And I find it almost hilarious because I love the way you characterize Artur and Molly and their protective instinct towards the kids... but let's be honest, Hermione, Ron and Harry have ensured the heir of the greatest house in the wizarding world to the cause.

One of the interesting parts about the Harry Potter series is that both sides of the conflict use child soldiers, and you get to see a realistic range of reactions to that from the adults around them. There's Molly, who's reasonably unconditionally opposed to it on the grounds that They're Children, and then Sirius, who unreasonably supports it on the grounds of being himself a stunted teenager, and then Mad-Eye, who reasonably supports it on the grounds of "they're going to have to fight anyway," and Dumbledore, who is some combination of these viewpoints depending on the situation — most protective of Harry when the danger is real, but perhaps necessarily the most realistic about Harry's role in ending the war. Lionheart has a slightly different cast of adults, because it's a different POV, but you still see a range of opinions from Narcissa ("you'll harm my son over my dead body, but also he needs to be able to defend myself") to Snape ("careful, Draco") to Moody (the same, arguably more so, because he's thinking of the long game) and Dumbledore (again, some situation-dependent combination of viewpoints). The kids are often so caught up in their own part of the conflict that it doesn't occur to them the strategic decisions that are happening over their heads — when you're a teen and an adult tells you you're too young for something, the kneejerk reaction is "fuck off" — but there are always conversations happening in other rooms, especially in Grimmauld Place.

[lemongrass77777-moved]

I will never be over the fact that Lily Potter was the one who defeated Voldemort in 1981 and she was never given proper credit for it in canon. We barely even know anything about her and she was the one who defeated the snake faced bitch the first time around. It drives me insane. Lily deserved so much better than what the books ever gave her.

[letteredlettered]

Another post just reminded me of an important PSA

Sokka is a better Ron Weasley and Xander Harris than Ron Weasley and Xander Harris ever were

Katara is a better Hermione Granger and Willow Rosenberg than Hermione Granger and Willow Rosenberg ever were

Zuko is a better Draco Malfoy than Draco Malfoy ever was canonically, but Spike is pretty great, even though yes, okay, we know, Zuko's redemption arc will always be superior

fight me

[wafflinglumos]

This fandom loves making Dumbledore seem like the most evil guy around, but he’s just very morally grey, he didn’t know Sirius was not guilty, because Sirius CONSIDERED himself guilty, which, he kinda was, inadvertently of course, but still.

Dumbledore didn’t manipulate Remus into following him, because Remus felt indebted to him due to Albus allowing him to go to Hogwarts.

Dumbledore didn’t want another Grindelwald, so, he did everything to stop it, which meant that Harry would have to be the one to stop it.

Dumbledore doesn’t manipulate people into following him, or blackmail them, because he doesn’t have to. Who would question one of the most powerful wizards in the world?

One for the many and all that.

Obviously not fair towards Harry, but genuinely let’s think about what would’ve happened if Voldemort HAD won?

[slitheringghost]

A narrative thread I find interesting is Family As Teachers and how characters influence and mirror each others’ abilities in familial dynamics - particularly in sibling/"twin" dynamics - which is fitting in a society where children’s magical education seems entirely controlled by their families until age 11 when they start Hogwarts and intermittently afterward. This theme is reflected in Ollivander’s words in DH while discussing the mystery of the twin cores and general wandlore with Harry:

"The best results [...] always come where there is the strongest affinity between wizard and wand. These connections are complex. An initial attraction, and then a mutual quest for experience, the wand learning from the wizard, the wizard from the wand"

You even have the three Peverell brothers inventing the three Hallows together to conquer death

Fred and George - as the actual siblings/twins, the most in tune - drop out and invent Weasley's Wheezes together, shared sense of humor via a literal Joke Shop. They find the Marauders' Map ("This little beauty’s taught us more than all the teachers in this school"). This twin duo sometimes turns into a trio - see post about Hermione’s contributions to their inventions in my meta Hermione As Teacher and Connections to Lily (who eventually joins the Weasley family, so like a sister to them); and additionally the twins’ best friend Lee Jordan helping them:

Fred and George Weasley with their friend Lee Jordan, all three of whom were carrying large paper bags crammed with Zonko’s merchandise Fred and George appeared finally to have perfected one type of Skiving Snackbox, which they were taking turns to demonstrate to a cheering and whooping crowd […] Lee Jordan, who was assisting the demonstration, was lazily vanishing the vomit at regular intervals with the same Vanishing Spell Snape kept using on Harry’s potions. (OoTP)

George then mentions utilizing Vanishing into their fireworks: (“Oh, I hope she tries Vanishing them next…They multiply by ten every time you try”). Snape’s skill at Vanishing ties to dynamic with Mcgonagall as she’s shown teaching 5th years Vanishing Spells in OoTP, and later in the book LV’s emphasized as weaker in Conjuration with his conjured shield, unsurprising given Dumbledore was his Transfiguration teacher.

THE MARAUDERS - James and Sirius collaborate on the Marauders' Map (with Remus; shared sense of humor built into it via insulting Snape), two-way mirrors called "twin" mirrors in DH; James's wand is "excellent for Transfiguration", he's a confirmed prodigy and Sirius is equal to him - both Animagi, McGonagall's favorites ("Both very bright, of course—exceptionally bright"), Sirius goes "I don’t need to look at that rubbish, I know it all" re: Transfiguration textbook; looking to create a new identity from his family's Dark magic, Sirius's interest in Transfiguration likely stemmed from James. Equal in DADA (finish the OWL early, "I’ll be surprised if I don’t get Outstanding on it at least" "Me too"), hex people together.

Remus - Dark Creatures interest from his father (Lyall was "a world-renowned authority on Non-Human Spiritous Apparitions" such as "poltergeists, Boggarts and other strange creatures") shown in Remus with Peeves and the Boggart lesson. A possible hint of Remus and Tonks friendship affecting her interests - Tonks helping with a "murderous old ghoul lurking in a toilet" in 12GP.

THE BLACK FAMILY - the Blacks are all brilliant. Sirius and Bellatrix are mirrored in battle implying Bella taught him and/or they dueled together - a connection transferred to Sirius mirroring James and Remus in combat ("Then, with identical fluid movements, they reached into their back pockets" in the prequel; "Then, with one movement, they lowered their wands" in PoA). Same weapons: Knives - Sirius slashes the Fat Lady and tries to stab rat!Peter, gifts a penknife that opens any lock to Harry; Bellatrix tortures Hermione and murders Dobby with a knife (potentially they keep them handy for blood magic - "rusty daggers" in 12GP nearby the crystal bottle of blood).

Bellatrix, Narcissa, and Regulus can all occlude LV and Bella trains Draco. Sirius knows a lot about Dark Arts and Harry's curse scar from the horcrux, Regulus identifies LV's horcrux, Bella is LV's Dark Arts student and given a horcrux.

Sirius and Orion - Orion warded Grimmauld Place, adding "every security measure known to Wizardkind", made it "Unplottable, so Muggles could never come and call"; Sirius maybe used his family's magic on the Map (a tool in part to make Hogwarts safe from teen DEs, and I HC Sirius worked on it most, as Hogwarts was also a home and escape from 12GP to him), role as Secret Keeper, offers GP as safehouse to the Order, undoes its enchantments to let halfblood Harry inherit. Sirius and Walburga both use the Permanent Sticking Charm - Walburga to terrorize and scream bigotry, Sirius to flaunt his differing politics with Muggle stuff.

I HC Bellatrix invented some Dark artifacts in 12GP - the "unpleasant-looking silver instrument, like a many-legged pair of tweezers, which scuttled up Harry’s arm like a spider when he picked it up and attempted to puncture his skin" which Sirius smashes with Nature’s Nobility: A Wizarding Genealogy (fits Harry and Sirius's interaction with Bella later in OoTP) and the "musical box that emitted a faintly sinister, tinkling tune when wound”, making them all "curiously weak and sleepy" until Ginny shuts the lid - placed right next to Merope's locket (esp. as Sirius’s words after this passage parallel Bellatrix in DH). Raised as the heir, Bellatrix likely had similar training and skill in wards as Sirius.

Bellatrix and Voldemort - paralleled in combat ("Bellatrix was still fighting too, fifty yards away from Voldemort, and like her master she dueled three at once"), both Legilimens. Her speech about the Dark Arts and learning "spells of such power" while teaching him the Unforgivable curses - she's likely as skilled as LV in inventing curses.

Dumbledore and Grindelwald - "just as precociously brilliant", "even after they’d spent all day in discussion — both such brilliant young boys, they got on like a cauldron on fire", "at last, my brother had an equal to talk to, someone just as bright and talented as he was". Twin imagery with Grindelwald as hilariously described like Fawkes.

Next-door neighbors, knew each other only for a few months, yet Grindelwald’s ideas "caught and inflamed him", Dumbledore’s "ideas helped Grindelwald rise to power". Collaborate on the fascism and Deathly Hallows quest, but not Dark Arts (vs. Snape and Lily share the Dark Arts experimentation but not the fascism). Both on the same level in dueling, can conceal themselves without a Cloak.

Bathilda Bagshot - Dumbledore's Mother Figure/teacher, "impressed by his paper on trans-species transformation in Transfiguration Today" which Dumbledore's shown reading, so she presumably mentored him in Transfiguration, clearly a favorite field (While Dumbledore had few close friends, McGonagall's maybe the closest equivalent to a female friend; echoes Snape with Eileen and Lily).

Elphias Doge - met at 11 on their first day at Hogwarts, "Our mutual attraction was undoubtedly due to the fact that we both felt ourselves to be outsiders". They "intended to take the then-traditional tour of the world together, visiting and observing foreign wizards, before pursuing our separate careers".

While the pair are said to not be intellectually on par, Dumbledore's interests clearly influenced Doge, also implied in Doge writing “his friends benefited from his example, not to mention his help and encouragement, with which he was always generous. He confessed to me in later life that he knew even then that his greatest pleasure lay in teaching.”

Doge on his travels mentions "experiments of Egyptian alchemists" and "escapes from chimaeras in Greece" (fire-breathing lion, goat, serpent hybrid) - echoing Dumbledore as a "Gold Medal-Winner for Ground-Breaking Contribution to the International Alchemical Conference in Cairo" and interest in certain magical creatures and associations with fire (Fawkes, dragon's blood uses, "trans-species transformation" research, bewitches a branch of Gubraithian "everlasting" fire which is Charms related, the Deluminator as a cigarette lighter).

Nicolas Flamel - Dumbledore's Chocolate Card notes his "work on alchemy with his partner Flamel" inventor of the Philosophers' Stone (colored “blood-red”) who taught teen Dumbledore; Dumbledore later enchants the Stone and links it to the Mirror of Erised (only one who wanted to find but not use it could get it, or they’d be shown making gold or drinking Elixir of Life). Albus also means "white", after an alchemy principle.

Marchbanks who examined him in Transfiguration and Charms N.E.W.T.s says he "did things with a wand I’d never seen before", won the "Exceptional Spell-Casting award"; published papers in Transfiguration, Charms, and Potions journals - linked more with wand magic fields.

Snape and Voldemort - From his words in HBP (disdain at Mundungus for not being a real Inferius), Snape likely learned necromancy with LV and enchanted Inferi during the First War (fitting to his vampire vibes).

Potions - LV uses "old piece of Dark Magic" rebirth potion; creates the Rudimentary Body Potion of snake venom, unicorn blood, spells of his own invention. Snape's Potions speech in PS - "the power of liquids that creep through human veins" (reference to potions with human blood?).

LV invents the Drink of Despair, Snape modifies the Elixir to Induce Euphoria (and assigns a dementor essay). Snape’s knowledge of poisons (logic puzzle, undetectable poisons essay, etc) and the bezoar trick as antidote, Tom poisons Hepzibah with a "lethal and little known" poison that passes for sugar to frame a house-elf who can’t carry a wand. Riddle petrifies students with the basilisk, Snape brews Mandrake Restorative Draught for basilisk victims (mandrakes heal transfigured or cursed victims, "an essential part of most antidotes").

LV curses the Gaunt ring, Snape heals that curse (golden potion and countercurse, collaborating with Dumbledore). LV turns the locket into a horcrux, Snape heals Katie Bell from the cursed necklace. LV curses the DADA job and the curse on his name, Snape invents Sectumsempra. LV the most accomplished Legilimens; Snape the most skilled Occlumens (and a skilled Legilimens). LV adds a concealed entrance on the Locket Cave/symbolic Gaunt shack, Snape renovates Spinner's End with two hidden doors (both in locations related to their Muggle childhoods).

Snape and Lily - to a large extent it makes sense that their magical abilities and interests align even more closely than any other duo save the Weasley twins, because they played the role of "family training" for each other for 2+ years. Both outsiders and ambitious with magic as their way out, Lily's joy at magic and Snape views it as an escape from home, closest to siblings living in the same town. Snape's keen on sharing everything (esp. if raised with an idea of how training works in magical families), Lily on knowing everything (and seems to be following Snape's lead on the magical world in a lot of ways).

Eileen clearly taught Snape a lot about wizarding society and I assume some magic, has all her school textbooks and likely some Prince family books/knowledge, with Dark Arts and Potions specialties, which Snape passed onto Lily. But Eileen either wasn't as gifted or intellectual as her son (we only know she's Captain of Gobstones) and/or just too neglectful for the connection to go far.

Snape tells Lily "you’d better be in Slytherin" in the scene he tells James "if you’d rather be brawny than brainy" re: Gryffindor vs. Slytherin, so he thinks Lily falls under "brainy".

Magical power - unsupported flight, Snape's a Legilimens and there's circumstantial evidence of Lily as one in the early memories.

As with J/S, Lily's wand predicts her mutual interest with her best friend/like-a-sibling (of course their main field as Potions which doesn't require much wandwork) - "Swishy, nice wand for charm work", the Prince invents Charms. They "swish and flick" in Charms (levitating feathers), associated with flight. If taking extracanon, willow's an uncommon wand wood with healing power, enables advanced nonverbal magic (Snape heals Dark magic/etc, invents nonverbal spells).

James and Sirius are wary of Lily's wand means she's a skilled duelist and has gotten into fights; Snape invents hexes. Given the theme of duel between brothers, dueling's traditional in magical families, so Snape and Lily likely practice dueled together too with similar methods (Legilimency in combat); though in application, unlike the Marauders at Hogwarts, they'd be fighting on opposite sides.

Slughorn describing the Prince's work as exactly like Lily's at every turn indicates it as collaborative as the above examples of duo inventions - "You’ve got nerve, boy", "That’s the individual spirit a real potion-maker needs", "Unorthodox, but what a stroke of inspiration", "I really don’t know where you get these brain waves", "intuitive", "instinctive" "a natural" - aka she's creative, inventive, unafraid to take risks with and push the boundaries of magic.

The Prince's disdainful "just shove a bezoar down their throats"; Slughorn laughs at the bezoar, says it's exactly like Lily, gives house points "for sheer cheek" - implies Snape and Lily shared sense of humor often consisted of making fun of how purebloods view magic and incorporating their Muggle background into their methods (matches "as there is little foolish wand-waving here, you will hardly believe this is magic"). Snape's interest in poisons led to the bezoar trick which is Dark Arts related, so Lily knowing the same also implies her Dark Arts interest (of course Potions masters, Aurors, Healers, etc all study poisons, but I assume going deeper into it leads to more effective healing, as with Dark curses and cursebreaking skill on the Gaunt ring/etc).

Like Fred and George, Snape and Lily experiment and invent together constantly over summers - Petunia says Lily "came home every vacation with her pockets full of frog spawn, turning teacups into rats" (Potions, Transfiguration) and the Dursleys don't know Harry can't do magic over summers in CoS, an easy lie for Lily to keep up when doing magic often at Snape's house.

Snape evidently came prepared to impress Slytherins - per Sirius, he was always fascinated by Dark Arts, famous for it, knew more curses when he arrived than half the 7th years (likely showing off his knowledge vs. immediately cursing others). Snape's very aware of Muggleborn prejudice (hesitates before saying it makes no difference), yet was set on Lily being in Slytherin for 2.5 years pre-Hogwarts and groans when she's Sorted elsewhere, so sharing his Dark Arts interest with her fits that, expecting she'd need to "get in with the purebloods" along with him, which means making sure she knows as much as he does (see this post).

Snape at nine thinks Lily's the odd one for being fascinated by dementors:

"Tell me about the dementors again." "What d’you want to know about them for?" "If I use magic outside school —" "They wouldn’t give you to the dementors for that! Dementors are for people who do really bad stuff. They guard the wizard prison, Azkaban." (DH)

Cue Snape's monologue about the Dark Arts years later:

“The Dark Arts are many, varied, ever-changing, and eternal [...]" Harry stared at Snape. It was surely one thing to respect the Dark Arts as a dangerous enemy, another to speak of them, as Snape was doing, with a loving caress in his voice? “Your defenses must therefore be as flexible and inventive as the arts you seek to undo. These pictures [...] give a fair representation of what happens to those who suffer, for instance, the Cruciatus Curse” — he waved a hand toward a witch who was clearly shrieking in agony — “feel the Dementor’s Kiss” — a wizard lying huddled and blank-eyed, slumped against a wall — “or provoke the aggression of the Inferius” — a bloody mass upon the ground. (HBP)

They absolutely mutually encouraged each other's interests in forbidden and Dark magic. Snape and Lily learn magic together, their magic individually and together parallels LV's the most, and they directly undo LV's own magic, Snape's instances even utilizing Potions.

Dumbledore expects Snape to immediately know Lily's work vanquished LV ("You know how and why she died. Make sure it was not in vain. Help me protect Lily’s son"), implying he knows Snape and Lily learned similar magic together and expects Snape to ~recognize Lily's style~. Converse to how he speaks to McGonagall the same (?) day:

"After all he’s done... all the people he’s killed... he couldn’t kill a little boy? It’s just astounding... of all the things to stop him... but how in the name of heaven did Harry survive?" "We can only guess," said Dumbledore. "We may never know." (PS)

Lily and Sirius - Sirius is also knowledgeable about curses - knows the countercurse for the biting snuffbox (Wartcap Powder) and examines his hand "with interest"; suggests the Conjunctivitis Curse "as a dragon’s eyes are its weakest point" which Krum who was taught Dark Arts; often the one consulted regarding Harry's curse scar, recognizes Priori Incantatem, Harry writing to Sirius when he wants someone like a parent "who had experience with Dark Magic".

Sirius breaks Black family tradition in undoing wards/protections on 12GP (maybe manipulating a form of blood magic?) to let his halfblood not blood-related godson inherit and block DE Bellatrix out; and Lily creates blood wards that'd traditionally protect a pureblood family house to protect her Muggle family and eventually protects Harry. Mirroring Snape and Lily weaving their Muggle background in their magic, Sirius enchants Muggle objects like the motorbike (and creates an alternate method of flight).

When Harry says "You never heard her, did you? My mum... trying to stop Voldemort killing me... and you did that... you did it" Sirius goes quiet, which may hint at specific knowledge that Lily vanquished LV (also a possible reason for Sirius rereading Lily’s letter in OoTP, when the Order’s trying to figure out what’s up with the prophecy and the Harry-Voldemort connection).

Harry and Ron - "In the end, he chose the same new subjects as Ron, feeling that if he was lousy at them, at least he’d have someone friendly to help him", write up absurd stories for Divination and make fun of Trelawney together. Harry and Hermione elaborated here.

Parvati and Lavender - Divination, both close with Trelawney (vs. Padma in a different house than her twin)

Moody and Tonks (who was "close to Mad-Eye" "his favorite and his protégée at the Ministry"), Bellatrix and Barty (if you accept he was her apprentice), Snape and Draco (“Draco’s favorite teacher”), Xenophilius and Luna - her family training consisting of... conspiracy theories, Luna first shown reading The Quibbler (Most likely Pandora Lovegood was a conspiracy theorist like her husband - "intellectual equals" - and died due to something like believing an explosive Erumpent horn was a Crumple-Horned Snorkack horn)