#undertale au idea

[julia-jck]

I came up with an idea and had to draw it...

I thought about how Sci always end up being a doctor in stories and fanfics, so I came up with a hospital AU where all characters are based on creatures known for healing and regeneration. So Sans is a doctor and based on asnake cause of the staff the Greek god of healing, Asklepios, owns and cause in ancient Greece the preasts would use sacred serpents for their healing (info based on the first info I saw on google...). And Papyrus is a nurse and based on a Hydra, a creature which grows two more heads when one get cut off, lol, and I think you need to cut of the head to kill it??? Can't remember.

Of course the others would also be creatures like this. I were thinking that Undyne would be based on an axolotl and Asgore and Toriel would be based on phoenixes.

[bamthefox]

weird idea for an au

undertale baked with love

in a more mundane timeline chara works for muffet and papyrus at their newly opened restaurant

(i just felt like drawing my favorite undertale characters with out mew mew i didn't feel like drawing her)

[fandomsfordays21]

Undertale AU/AM idea I have:

So, this idea has been bouncing around in my brain like a ping-pong ball for the past year or so and I've decided to put it out there for you guys. I'm going to post each of the character ideas in their own posts and get around to drawing them at some point once I get through artblock.

So, this idea started as a Rainbow Factory AU where Ink got his vials/paints from other monsters by extracting them from their souls, but it evolved into something much more advanced and complicated that I like to call the SOUL Experiment AU/SEA.

Long story short, Error is a sort of mad scientist who has a fixation on Souls, both human and monster, and experiments with them. (This motivation is caused and motivated by Geno, but that story is for another post.)

These experiments range from extracting different colors from different Monsters and observing the effects they have on Ink, doing studies on the Dreamtale twins (Who work for him in this au while also being studied.) and their empath abilities as well as the corruption Nightmare has, a study on the possibilities of distortion within a Monster Soul (Killer), and the most extreme and groundbreaking of them being the combination of two separate Souls together to create one entity. (These experiments include, the combination of Frisk and Chara, the combination of Dust and Dusttale!Papyrus (Who we call Ash here), and of course, the combination of Cross and X!Chara (Who is simply called X).

Like I said, specifics about the characters will be in their own posts as well as the specifics of my Magic/Soul system, but if you have questions before those come out my ask box is open.

There's a lot of cool ideas I have for this AU and I wanna get around to posting art about it or maybe even writing a fanfic about it.

I hope this gets some traction because I would love to share my ideas with you guys! Please let me know if this idea seems interesting to you so I know if I should keep working on it!

[silverstormsxx]

if anyone wants to make an underrune take

please swap swatch with grillby and spamton with muffet PLEASE-

[justthemoonz]

I've seen a recent trend of AU-ifying other UT characters on Twitter and wanted to share my idea of an Aftertale Flowey

[bingobongohatestaffy]

I need to ramble about this idea because I think it’s actually kinda a fire au idea-

Alr so.

Y’all remember that “Human, I remember your genocides” meme?

What if there was a au about like.

Frisk redoing the pacifist route over and over and over again, and Sans just. Remembering the human taking them all to the surface, they all have their silly lil happy ending, and then Frisk pulls a “Hah get baited” and resets like over and over again 😭

People talk about how Sans would be like, mega traumatized over seeing his friends die over and over again, but imagine the HEADFUCKERY sans would go through after finding out the human is just taking away their future for shits and giggles, then comes back all nice like “Yeah imma befriend everyone 😼” like they didn’t just reset everyone’s happy ending 💀

Idk I think this is a cool idea, I might make some concept drawings for a au like that because I feel like this is like. Untapped potential 🤯 imagine sans just being fucking hopeless because he legit can’t fight the human after pacifist runs, so he just has to deal with a constant loop OVER AND OVER🤡 (L on his part)

[ashersbraincell]

Before anything I’m coining this idea so please credit me 🥺

Okay so you know how the narrator in slay the princess is, well, encouraging you to slay the princess?

And how the old common fanon interpretation of Chara was them encouraging/possesing(which, might I add narrator from stp ALSO does in some instances) the player/frisk to kill all the monsters?

The idea’s not quite done brewing in my little head yet but it’s definitely a cool idea for an Undertale AU

Obviously the idea of it being a love story would have to be tweaked but yeah

Think I would name it Slay the Monsters(under the mountain), and I think frisk would look a little more like a knight. Maybe taking Inspo from the unused “hero” character design?

OH MY GOD. AND THE OTHER HUMAN SOULS COULD BE THE VOICES.

would probably tweak their traits though.

Kindness would probably be useful for going against the Narrator’s(obvs Chara’s) wishes.

Justice mayybbeee kinda like Opportunist? In the way that they switch sides I mean. Like they would originally be on Chara’s side but as they see the monsters as their own individual people they would think It’s more “just” to spare them and talk things out.

Integrity I’m not sure about, I think they would mostly stay on our/frisk’s side with staying true to themselves and their initial stance. Though in that way perhaps their motivations would be set via what your first “path” was, and staying true to that.

Patience would be similar to the Cheated, in how you straight up just walk away. They’d probably argue for simply waiting fights out, or at first simply waiting for rescue on the flower bed.

Bravery would be VERY similar to the voice of the Stubborn, abso-fucking-lutely! Like in the Adversary routes, definitely on Chara’s side.

Perseverance would be similar to Integrity that they would only really play a bigger role later down a route, criticising alternating between „paths”. Ie killing the first few monsters, then being pacifist for a while and then killing again for no reason. They would also be the one to encourage us/frisk to keep going in death. Overall neutral on whether we kill or spare though.

[it-came-from-mount-ebott]

Horrorshift take where Asriel ends up convincing himself he’s some sort of dark lord, and Chara is his “second in command”.

[charaofthedead]

i thought the chara of the dead art would be done to day but i was wrong so heres a chara i made like 2 weeks ago + their underground

au names the marvelos tale

"If all you want is love .....Well I may know a special man"

[sunset-serenity]

AU Idea #2

| HorrificShift |

Unlike HorrorShift which is

StoryShift but Horrortale.

HorrificShift would be like

Horrortale but StoryShift.

Horrific instead of Horror, less Horror and just Horrific, while Shift actually makes sense and isn’t just a “Swap” as the story and character roles are more shifted than swapped.

Short-Basic explanations;

(1) Frisk would be the protagonist.

(2) Aliza would take StoryShift Chara’s role

(3) Flowey would still be Flowey taking in StoryShift Asirel’s role.

(4) Sans would take Horror Undyne’s role and the ruler of the underground and the main antagonist.

(5) Undyne would take Horror’s Sans’s role

(6) Papyrus would still be caretaker of the ruins (in a way)

(7) Toriel will take Papyrus’s role as the random social anarchist that wants to take Sans’s rule despite their difference in power and social influence.

(8) Alphys and Asgore are long gone.

(9) Clover is the reason why the underground is more of a mess even if they fallen into Sans’s hands despite their genocidal actions against monsterkind that only strengthened Sans’s social influence more.

(10) Chara is still the first fallen human while Aliza is the second.

(11) Chara straight up died from the fall and their soul was imediately taken in by Sans who was watering the flower bed.

(12) It’s 8 human souls, no human eating except the corpses of the 5 humans that fell.

(13) Asirel died and became Flowey during the war

(14) Grillby is the Royal Scientist after Gaster and Alphys.

(15) Fill in the blanks as I go along for the long-story explanations.

Long-story explanation

Aliza

Aliza fell into the underground, met up with a seemingly gleeful yet withered talking one-eyed flower, and while walking through the ruins, she was taken in as a prisoner by Papyrus by surprise and taken all the way into Sans’s palace, which she then was imprisoned instead of dying to Sans’s hand, due to Papyrus’s commands to Sans and Aliza’s fearful cries and pleas, still, even when temporarily spared, there was much to worry about the first human falling here and a hopeful way of getting out using other souls, however Aliza, the 2nd human. was mercifully let go from good behavior and even life-threatening sacrifices they made that shocked many others, they were also granted citizenship into the underground by Sans. Instead of taking her soul for the underground, Sans saw promise in Aliza and her potential to capture other humans because of her seemingly loyal and scared nature Sans found amusement in.

She was let go of all charges but was forced to comply to the capturing of other humans. Before that, she decided to live a little, getting some new clothes suggested by Flowey who thought it looked “awesome” and “super cool” with a sigh and a smile she bought new equipment to start off her journey,

After that, many human souls were captured for Sans’s irresponsible yet obviously manipulatively playful plan of freeing all monster kind. Aliza was sacred and damage and barley getting by from Flowey’s scraps he found (not even getting payed mind you)

But now.

it was time that they met Frisk,

In a Pacifst route, Frisk will have to fight her, but after many respawns, she gives up realizing Frisk is the first human she knows that has determination despite being scared out of her mind of the consequences of not capturing the human she spares you, after sparing Aliza, Aliza would go into hiding with Flowey making sure no one rats her out and she gets caught for not capturing the human only to probably be beheaded by Sans. Howeever you can find Aliza, and when you find Aliza you can talk to her and get some lore and nice moments with Aliza about her situation, life, Sans, the residents, rules, etc. You can talk to her at any time in the story and whenever a main story situation happens you can get new info from her about it.

In Genocide she sees the genocide and decides to help but after seeing some monsters she actually somewhat cared about begging for mercy, she steps in realizing that both sides are in the wrong in this war, and with her final breath after going all out in a grueling fight giving it her all, her last words are “I hope you still make the right decision.. no one should deserve this, should they?…please…tell me..” (This of course happens if you are quick enough before Aliza realizes your basically immortal and flees away to survive another day)

Personality

She can be very fearful because of Sans’s rule over her, but when she isn’t scared she can be extremely too chill for her own good, juggling forks around with just a few fingers and doing knife tricks with a literal butter knife whenever she’s bored and can make corny wholesome words of comfort and encouragement whenever she can.

Stats

Similar to Storyshift except her Hp and Def are lower while her Atk and speed are much higher.

Equipment

She would wear simple purple dress that resembles her old one but with a added hood and pockets. (that would later get more worn, ripped, and tattered after every human capture) And for her main weapon of choice, It would be sycthe half her own height. After some Royal Guard training and special lessons in human abilities including her own, she was finally prepared.

In battle she would use her Sycthe, some different design of blasters made by Sans for her to use, limited telekinesis that makes her eye glow purple from under the hood she usually has on. And maybe some modified utensils and spikes as some basic weapons used during her battle.

Frisk

Unlike in Undertale, Frisk is pretty much entering the underground willfully out of much talk in their home town and found it interesting.

In Pacifist, Sans takes the human souls in one last showdown but after beating him and sparing him, he is conflicted on why you’re sparing him, but despite this Frisk takes the human souls, after seeing the humanity still left in these monsters, they took it upon themselves to take every human soul and break the barrier themselves. But warns Sans that if he harms humanity, humanity will harm back and won’t be merciful.

In Genocide, Chara is revived (in a way) like in Undertale, and the usual genocide stuff happens just like in Undertale.

Personality

-.-

Stats

Normal

Equipment

Their appearance is somewhat the same but instead of two stripes it’s one, colors are more faded, the blue looking more grey and the purple stripand their pants down to their shoes are black with fingerless black gloves meant for heavy duty, and a utility belt that gives them/you the player, more storage for items.

Sans

During the war many had fallen, including Asgore in battle, and Alphys by an invasion in a secret human laboratory they took control of at the time. Before Asgore fell, Undyne and Sans had a argument while hiding out during a mission, they argued about the war and why he is forced to fight out there, Undyne (who is more cruel in this version from stress of the war and loss of Alphys) filled with anger shot at Sans with a spear, nearly killing him and leaving him for dead. Saying to him “If you’re too weak to fight you’re as useful and strong as a dead body! Coward..” After that, Undyne finishes the mission and falsely states that Sans had died bravely in battle with Papyrus in disbelief (No pun intended) However after one last stand and a sorrowful sacrifice from Asgore in battle, Papyrus had evacuated everyone. With a dead king everyone picks who should be leader, Toriel declines stating she isnt prepared for this role yet even if she has to but Undyne charged foward to state that she’s strong enough to be the leader but was immediately interrupted by a manical laughter that filled the storage room full of soldiers with dread as the spear is still in his head, with a shocked Undyne, Sans says “You’re right Undyne, I was a coward…but you, you still are. And I ….I just held back..”

Of course, after much discussion Sans, with less than a fraction of hp left becomes the king of the underground

“I’ll keep your stick..fish. Heheh.. it suits the new me quite well.. I haven’t actually realized how much I could do…”

After being healed he still has the crack on his head and the spear now somewhat submerged to his head while blood still remains there both the blood and spear and crack as a reminder to himself everyday on what he should’ve done long ago and what he should do now.

Undyne was hunted down for treason and hides away, even when all the monsters were sealed she kept a good disguise on while using human technology to modify her voice.

Sans in this AU is both StoryShift Sans and Horrortale Sans equally, he doesn’t care much for the monsters anymore until he’s reminded of his brother, then he goes in circles about what he’s doing if it’s right or wrong, then a mental snap kicks in and his sick plan of how he enjoys life and frees monster kind while a nice human meal comes in every blue moon. Continues foward.

In the Pacifist route, he is remorseful and watchful of Frisk and humanity, allowing monsters to breathe and find freedom in the surface again, and once he meets Papyrus again, it all starts to put together pieces of a puzzle once broken.

In the Genocide route he goes all out using everything against you and having two main weapons, a spear and a bone spike that changes color, and even in death threatens, warns , makes fun of Frisk every chance he gets until his last moments.

[One important thing to note, while staying alive from Undyne’s attack, he slowly and silently woke up to a human soldier who was checking the area he was still in, Sans kills them in desperation and tested a theory his almost forgotten pal G once had and absorbed half their soul, letting the other half shatter, this soul was a soul called Perseverance that had minor amounts of Determination. Since the story is shifted, I’ll shift it in a way that it takes like probably 10+ human souls more or less to make a monster into a almost unstoppable being instead of just 1, thus also why Sans is strong enough to be the lead role of the underground in complete and almost dictatorship since no one knew they could absorb souls except him and G.]

Personality

Twisted, messed up in the head quite literally, Sickening, disturbing, kinda evil kinda broken inside and outside, very causal about almost everything. Very threatening and scary in power and demeanor and voice. Also very careless and reckless which led to the sealing of the underground still happen. Likes to be imposing as much as possible, but when that doesn’t work he threatens and pretty much tries every tactic in the book until you spare him enough.

Stats

Atleast twice more in stamina making the fight be atleast 2x longer than normal Sans.

Hp is 1.5 or 2. Atk and Def atleast 10x stronger from free time training and the human soul he still has absorbed until the Pacifst route.

Equipment

Sans wears more refined clothes than his StoryShift counterpart while also having some dried blood on his clothes that cant be washed away anymore. His cracked injury that he keeps substained as a reminder, the spear on his eye and the disturbing damaged look on his face.

In the fight he rips off the spear using his right hand which then starts the usual Asgore fight. In which he bleeds from his injury; from the eye to the teeth. This is also why he lost 0.5 of his 2 hp In the fight. In battle, he uses a wide variety of bones, normal, sharp, all having dried blood on it, there would also be blue and orange bones, and a cracked bone which can be destroyed without taking any damage. He uses the spear he ripped out of his eye socket with his right hand and sometimes used a bone spike on his right hand that he would occasionally throw at you/Frisk. Also of course gaster blasters that look like normal Gaster blasters except a few modifications to them.

He will also use determination and perseverance related abilities in battle but this happens every rare chance and it’s usually one attack.

Undyne

Lone puppy in a wolf’s fur taken almost literally. Wears nice robes that suits her character while also mysterious, new gaunlets and boots, anything that covers her skin and nice skull looking mask that can be switched for a more stealthy dollish rabbit looking one.

Changed her spears into energy swords that resemble a Falchion.

Personality

Very reserved, somewhat bitter and resentful, angry, emotional in her alone time, very bold and harsh even when disguised. She spends a lot of time alone and really likes punching rocks, trains a lot on her own.

Stats

Atleast 0.5X stronger and higher than normal.

For anyone who finished reading this incredibly long AU I came up with thanks.

I seriously do not know how to give thanks for this but thanks, it would be a surprise if anyone genuinely reads through this let alone thinks this is a good AU idea and if I made a good story out of it. ☕️🤍

I could write more and go on and on explaining every lore detail but this already a google document too long haha.

Let me know if you have any questions about it or anything. (That’s if anyone even sees this)

[Got the Sans sprite from a google image search, it’s not mine but can give a good idea on how a HorrificShift Sans would look like, good sprite made by the person who made it though, credit to them plz.]

[bamthefox]

Ya know what would make a hella funny au,

Deltarune but castle town is just a really fucking big apartment complex.

Ya know what, what it just all in the light world, like all darkner become lighter, lighter fucking die I guess idk or their just workers

[fandomsfordays21]

Soul Experiment AU: Experiment 041: Ink

Thanks for the support on my previous post about this au!! Since Ink and Error are going to be the "main" characters in this au. I thought I would start with them. I have more ideas on what to do with Ink though so we're starting with him. I'm going to do a poll after this so you guys can decide who I post about next. I'm planning on posting about one character per day as well as posting about my magic/soul system and then I'll work on some other stuff for this au like maybe a fanfic if enough people like it. (I'm also aware of how badly this is written, it's hard to fit all the details in this post alone. There will be separate posts about each character that take the form of Error's "Scientific Entries" but I wanted to go for a more narrative format here. Once again, ask box is open if you need clarification on anything here. I will answer even if I plan on including it in another post.)

To begin with, Ink actually has a Soul in this au, but it just doesn't work properly. Monster Souls work as both the heart, brain, and all other organs that would normally be present in the body of a Human. The "brain" functions of Ink's soul do not function properly, as his soul does not produce the magic needed for emotions and motor functions. This is where Error comes in.

Ink was taken to the lab to be used as a subject for experiments under the name "John Doe" as he had no identification, probably no family, and it was thought that he was fallen down, and that there was no hope for him. Ink was exactly what Error was looking for in a subject, a skeleton monster, fallen down so his soul must be in a deteriorative state, and he was completely unresponsive to any and all stimuli. This made him the perfect subject for Error to test the different ways he was going to wake up Geno.

Once Ink arrived to the lab, however, and Error got to do a proper examination of the nameless shorter skeleton, he came upon a problem. This Monster... wasn't fallen down. Sure, he was unresponsive in a way that was incredibly similar to the coma-like state of a fallen Monster, but it was different. Ink's soul was completely intact and undamaged, and so was his body, his HP and all other stats were completely fine, so what the hell was wrong with the subject?

Error called in the Joku twins, Dream and Nightmare, both coming from a family of Monsters with emotion-based abilities, both brothers being the last of the line and with the strongest recorded abilities. They sensed... Nothing? There was no emotional output from the nameless skeleton's Soul whatsoever, or even any emotional input, since neither of the twin's auras had any effect. This is where the experimentations began.

First line of business was to identify the problem. A Monster's Soul is similar to an organ, yes, but also so much more complex. Was the problem within the emotional magic portion of this Monster's Soul? Or was there another underlying problem that was causing it? If this Monster truly did lack the ability to produce emotions in his Soul, so much so that he was in a vegetative state, then how was he alive? How had he lived to be around the same age as Error? The scientist shook his head, 'I have more urgent things to worry about with this subject.'

A breakthrough. There was a breakthrough in Error's research that he had never seen coming. He had figured out how to isolate the emotional magic in a Monster's Soul. More importantly, he had figured out how to extract it. It wasn't a nice process, the Monster's had to be fully alive and aware during the extraction, which was incredibly painful and had lead to the death of many subjects, but it was incredible. If Error could manage to directly transfer magic from one monster to another, he could very well do similar with Human Soul traits or even entire souls.

However, this had to be tested first.

The original trial of Ink's colors is one of the few he can actually remember. He woke up on a cold metal stretcher with a bunch of machines making noise around him. His whole body felt weird and heavy. He was feeling emotions at the time, yes, but also didn't feel quite right. Like something was missing or that he didn't have enough of something. This was, of course, due to Error only providing a low dosage to start with, in case anything went wrong. Ink, of course, didn't know that, nor did the notice the glitchy skeleton wearing a lab coat that was sitting in the corner of the room, observing quietly and taking notes.

Ink blacked out again within two hours.

There was lots of testing done after that. The first trial was called that for a reason, after all.

Error introduced himself properly to the shorter skeleton by the time of the second test, seeing how the subject would respond to another person, which was met with overwhelming enthusiasm and then a puddle of vomit on his shoes.

That was a problematic side effect.

The main problem with harvesting emotional magic is that each emotion has to be harvested individually, and each is a different color. This was a problem because no particular label was given to any color, so testing each color and then recording the results was the most probable solution. Followed by giving more or less to see what dosage was the right one. There may or may not be a particularly ripped page in a notebook that desperately outlines the dangers of an intense amount of red.

Every time a test was conducted, Error would ask a series of questions to see if the influence of different concoctions would yield different answers, but also to learn more about the individual with the strangely marked bones. Oddly enough. Ink had no memory of a time before waking up in the lab, and never remembered anything that happened between tests. The memory problems were consistent, unfortunately, however not on the level of amnesia that was previously suffered. "Ink" is a chosen name, based on the markings on his face and the rest of his body.

Months passed and eventually Subject 041, or "Ink" as he had chosen to be called, was functioning as properly as an individual with a malfunctioning soul could. Going outside the lab was an option now, and Ink does regularly. He carries around vials full of each color (He decided that ingesting it was much easier than the injection method being used prior) but still lives within the lab as it is the source of his ability to feel and is where most of his companions live. (Getting to see and bother Error on a daily is a plus too.)

[silverstormsxx]

someone please make a swap au where muffet is frisk and napstablook is chara. not only do I need more napstablook-muffet interactions, but the double ghost joke for napstablook is too good to pass up

also i feel like muffet's weapon would be a teacup and she just throws scalding hot tea at enemies. her armor would probably be like a spider web she got tangled into on the way down

[justthemoonz]

Asriel - Chara swap AU where Chara is a narrator who wants to escape your soul, but Flowey still exists and is still Asriel

In the genocide ending Flowey actually takes the human SOULs and has control over it, he appears in True Pacifist and says you're in his world

dialogue

[maddrumsticks]

Undertale AU Idea I'm too Lazy To Draw

Except for the initial concept, I came up with every detail five minutes ago while I was showering. (So there will in fact be gaps)

It was a completely normal AU, with no changes whatsoever from the original. But the ground suddenly gave way. Every single citizen of this AU fell into the vast expanse of the void and shattered. Broken pieces just floated around emptily in the void, with no thoughts or memories left.

Somebody once started creating an AU that was now left abandoned. This AU was basically going to be a copy of San Francisco but in the Undertale universe. This creator never added people, abandoning it basically as soon as they created it.

But a shattered piece of Sans found this empty, vast city. And once one piece finds something, the other pieces follow.

Sans pieces found their way in buildings, in the ground, and everywhere in this city. Everywhere except a concrete body.

Sans could think, he could feel, and although his brain was a mess, he was corporeal.... He was a whole entire city, what the heck.

Sans missed his brother. It didn't take long to discover that he could create holograms of his brother wandering around. It made his city feel less empty.

Outcodes began to wander here. And this place became known as Sans Francisco.

A few extra details: Sans Francisco can serve as a travel point for AUs that can't travel between worlds on their own.

Sans Francisco usually has his teeth as the ground, and his eyes appear anywhere on buildings.

He can talk, but he's very, very hard to understand.

Dumb AU but fun to think about. Feel free to ask whatever questions you want and stuffs!