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parafic · 2 days ago

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Mostly it's that I've been reading and absorbing fandom personalities for them (Izuna dramatic and showy, Hikaku The Sane One) for... however many years, and I'm trying to do something a bit different with their personalities, but those standard ones are still ingrained.

So for Izuna, what caught my attention is that apparently he's described in the data book as something that gets translated as 'peace-loving' or 'harmonious' (and probably other things, but those are the ones I've seen). Which is kind of a contrast to the very little we see of him, in which he seems very eager to fight and distrusting of peace.

It could just be that he's in favor of peace generally, but distrusts the Senju specifically and we just don't see his opinion on peace otherwise. But I think, combined with how Madara and the Uchiha fell apart without him, it's also reasonable (and to me, more interesting) to interpret that as a reference to someone who values/is a source of interpersonal harmony. Izuna is the one who notices and redirects a conversation before an argument starts, soothes ruffled feathers, listens to peoples' concerns and persuades them to give Madara's latest strategy a try, finds an excuse to have a celebration when people need to be cheered up, notices if a clan member is being excluded and figures out what's up and how to fix it. He keeps morale up and everyone working together.

But the flip side of that is someone who's really conflict averse (emotionally speaking), and to do all that effectively for a whole clan, he's constantly putting on different personas. So like, that common characterization where he's dramatic and demanding might be how he acts around Madara, because Madara likes having a baby brother, but he doesn't do it around anyone else. And he'll have a bunch of other different ways of acting for when he's around younger shinobi, older shinobi, various groups of elders, kids, parents, etc, based on what they expect of him/like him to be. (Everyone does this to an extent, but I'm thinking Izuna does it a lot more than most.)

And at the same time, when things upset him, he's likely to let them go because he doesn't want to start an argument, people would be upset if he asked them to stop, etc, and if he just ignores it then nobody's upset so no harm done, right? So the end result is an Izuna who's barely (if at all) more aware of his own emotions than Tobirama is, he just has a very different mask.

So from a writing perspective, that is a complicated character to write anyway, and it overlaps enough with the popular characterization I see that sometimes I'm not entirely sure which I'm writing. Also this is a weird and extreme situation that Izuna has no preestablished way of acting for, so in-story he's struggling to figure out how to act to begin with. So it's a lot to balance, basically.

Hikaku is a little simpler! The way I'm characterizing Izuna overlaps some with Hikaku's usual only sane man/The One Who Gets Things Done role, so I want to give Hikaku some other traits so that he doesn't feel redundant. I also think he deserves to get to be Uchiha dramatic sometimes too, but I don't want to just give him a copy of Madara's/Izuna's/Sasuke's usual personality.

So I'm aiming for him being quieter than they are, but without just being calm, and more willing to argue and criticize (or just snark) than Izuna usually will be. But he's also starting out in an extreme situation that has him very off kilter emotionally, so he wouldn't be acting exactly like himself anyway, so I'm trying to figure out like, his baseline personality, and also how that's going to be affected by what's going on at the same time, so it's kind of doing two steps at once. (And is part of why I've been using his POV so much; it helps me work all that out when I can just write out all his thoughts as I go.)

Honestly the tunnel visioning is probably most of what ADHD Tobirama will mean for this fic; it's more that I just looked at how I usually characterize him and went 'yeah that sounds like ADHD'. Though Hikaku mentioning that Tobirama is "even rapidly bouncing his heel against the floor the way he seems to do when deep in concentration" is a bit more deliberate reference to Tobirama showing ADHD symptoms (since fidget toys are not exactly abundant in this setting, and he'd probably consider them too undignified to use himself anyway).

The sensing bloodline limit is all me! One of those headcanons that technically kind of contradicts canon a little but like. I prefer it. (Though @domoz is using a variant in the Hanahaki-adjacent AU!)

Basically the idea is that usually, a person's chakra system is like the circulatory system: it's more or less closed off from anything external, your body produces and uses it, but anything from outside is going through the stomach or lungs or something first.

But in the Senju, chakra is a little more permeable. It's a little more like, say, the water in a bay: it's distinct from the ocean but it's not cut off from the ocean by any means, and there's always some amount of flow back and forth.

So, because they're always having a little bit of chakra flow back and forth with the chakra around them (both natural and other Senjus' chakra), they get passive sensing. Which is not entirely as useful as it sounds; range is based largely on how much chakra a person has (though they can extend it or pull it back with conscious effort) but learning to distinguish chakra signatures and place their location is difficult and much rarer for someone to be good at. Hashirama for example technically has a bigger sensing range than Tobirama, but he can't distinguish signatures or estimate distance well, so it's not much use for him. (Though he will be able to tell that Tobirama is still alive while he's trapped on the island.)

All Senju (with this trait) do have the advantage of being able to feel when another chakra signature is present though, since basically no one else knows this is a sense to hide from. Senju can also read shifts in peoples' chakra the way that other people might read facial expressions, which again other people don't usually learn to control or hide, so the Senju get a nice edge there.

(In this headcanon the sensing jutsu, which Hikaku uses in this fic and is used in canon, was invented in the past to both give allies access to some of the same information the Senju had, and to cover up that what the Senju were doing was not a jutsu. Which is why both exist.)

Senju might also have a bit of an advantage at using elemental and/or sage jutsu, because their chakra is always a little bit bleeding back and forth with natural chakra, so it's more familiar to them. Not a huge advantage though.

The vulnerability is poison. Most poisons target the physical body and very few target chakra itself (with the exception of chakra suppressing poisons, which are more common). But when a Senju is hit by something that turns their chakra toxic, it will spread to every other Senju in their range, and then in all those Senjus' ranges, and....

So best case scenario an entire team gets wiped out. More likely it's several teams in the same area. Worst case scenario someone gets hit with something while Hashirama is alive, it spreads to his chakra, and from him it spreads to every other Senju with the same trait, and that's how the Senju clan disappears.

Tobirama escapes because he happened to be in his lab at the time, which is shielded against chakra going in or out, in case he accidentally invented something chakra toxic. And some Senju, presumably including Tsunade and Nawaki, just don't have the trait to begin with so they survive. But most of the clan falls over dead within about an hour, which Senju generations ago more or less saw coming, which is why they kept the bloodline so secret and tried to breed it out.

(Some non-Senju in allied clans that intermarried would probably also have had the trait and died along with the Senju too, but I have not planned anything detailed about that because that is the bad ending AU and I don't enjoy those.)

a lot more focused on the results of interaction than the often annoyingly intricate path to get there "correctly", except people put a lot of stock on the "correct" path of behavior and WILL react weirdly if you don't follow enough of it.

Yeah! Tobirama is very focused on efficiency and getting things done, and he thinks everyone else ought to be equally focused on practicalities, so he has no interest in wasting time on being indirect.

I do think he can be polite if he has to--he's a clan heir, he's going to get stuck doing politics and diplomacy to some extent, so he doesn't really get a choice about learning this, and he's the type to learn how to be excellent at it because it's important even if he hates it. (And he's aware of appearances, demonstrated by scolding Hashirama about dignity in public and such.) But getting him to use those skills when he's not in an explicitly diplomatic setting (or maybe in disguise) isn't likely.

(Which does again make him kind of the opposite of Izuna; Izuna is compulsively diplomatic, because he sees value in building rapport and connections with as many people as possible. Izuna is building a tightly-knit community while Tobirama runs a well-oiled machine.)

You're welcome, I'm glad you like the songbirds! If you haven't read it, you might like @denialcity's hanahaki AU, for adoration grow. Somewhere in there is a scene where Izuna sings for Tobirama and Tobirama discovers that music can make him Feel Things.

(I also have equivalent headcanons for the Senju and Uzumaki collective hobbies, but they're not musical.)

Sparring will lead to yet another culture clash, in which the Uchiha decide the Senju are insane and Tobirama is judgy (after he gets over being freaked out).

The Uchiha aren't having too difficult a time; Kagami isn't old enough to know most sharingan secrets, and Ruri is old enough to know what not to say. Plus there's a general politeness norm among shinobi of not asking about clan secrets when clans are interacting in a polite way, so all the kids generally know not to ask (and probably don't know too many secrets even if they were asked).

Tobirama is having a bit more difficult a time keeping Uzumaki seals hidden, because the Uchiha can copy any seal they see him make and that would be that. But again, the Uzumaki kids are mostly either too young to know seals or old enough to remember not to share them, so Tobirama mostly has to hide his own work. Which is a bit inconvenient, but he can just tell the Uchiha to leave so he can make a seal, and can sense whether anyone is close enough to watch him, so it's workable.

They also don't really care much about other clans' secrets. If a kid from one water country clan gives something away to a kid from another, that is not their problem and they have bigger things to worry about. Rescue your own kids next time if it bothers you. Aside from the Uzumaki the clans here are too distant to be allies to either the Senju or the Uchiha, so they have no obligation to care and are already doing these clans a huge favor by rescuing their kids, keeping them alive, and eventually returning them.

Thank you! The jutsu definition headcanon is mostly Domoz's, although I did adopt it immediately.

And there actually aren't really secrets to worry about in that case! The Uchiha know that if a Senju uses a jutsu, that Senju will probably also know several 'related' jutsu; that's not something the Senju could or have attempted to hide. It's basically a semantic difference; the Senju label something on jutsu and the Uchiha label it a cluster of related jutsu, but everyone's still aware that the options exist.

Izuna specifically has been expecting Tobirama to show up with a 'new' water dragon jutsu for some time, so his reaction is more along the lines of 'of COURSE you can do this now'. Though he WILL be annoyed at Tobirama insisting that they're all one jutsu. Izuna takes pride in how many jutsu Tobirama has invented to fight him with, stop trying to ruin his score!

(It will probably come up very late, though; the most likely prompt for this is Tobirama being introduced to the Uchiha jutsu library, and that is a post-relationship thing motivated maybe by Izuna and Hikaku innocently trying to give him a gift and possibly by hopes of interesting him in the sex jutsu section.)

Tobirama has at minimum collected some hints about Uchiha organization! He's trying to figure out exactly how hierarchy works between Izuna and Hikaku, and who Hikaku is that he seems to sometimes have equal authority to Izuna.

The Senju have basically one hierarchy: Hashirama at the top, Tobirama second, and everyone in charge of various things they've delegated answering to them. War and missions are all built into the same system, and shinobi are sent where their talents are needed, because the down side to having a wide variety of talents is that you often only have one or two people that can do any specific thing. So a Senju who's good at sneaking in and stealing things, for example, will be sent to steal the enemies' battle plans and that valuable vase some lord wants but can't buy.

The Uchiha basically all learn the same style of fighting, the same types of jutsu, etc; obviously there's some variety but nothing compared to the Senju. They also might just have more people in general. So they have basically two hierarchies; the war/battle shinobi (who are led by Madara and Izuna) and the mission shinobi (who Hikaku is in charge of). The two operate in parallel, and shinobi generally only are part of one, not both (other than kids/young shinobi still figuring out where they fit).

(This could also have gone the other way around, and had the clan head running missions primarily and someone else handling the war. But uh, Madara and Izuna are both very war-oriented. In other generations it's been different.)

As a result of that, since they're on a mission, Hikaku is actually officially in charge here. But Izuna is the clan heir (and functional co-clan head) in addition to co-head of the war, so Hikaku is used to deferring to him and Izuna is used to being in charge, and Tobirama's presence is another argument for Izuna to take the lead because Hikaku has no personal experience with Tobirama. So Hikaku and Izuna are kind of unclear on who's in charge here, which is fine because they trust and respect each other and agree on their goals.

So that's what was going on when they're trying to plan how to attack, and Izuna says he's outvoted and makes Hikaku do the negotiating instead; if Izuna was actually in charge of the mission he couldn't be outvoted. And Tobirama doesn't know exactly what's up there but he's sure something is, so he's Observing. (And also why he asked about whether Izuna would follow the plan he and Hikaku made; he expects Izuna to outrank Hikaku the same way Tobirama would outrank any teammates he had on a mission, and Tobirama wouldn’t necessarily be obligated to keep an agreement/follow a plan any other Senju made, so he thinks it’s weird and suspicious that Hikaku is making the plans instead of Izuna.)

He was also fishing for information during the "you deserve to suffer slightly less than bloodline thieves" exchange; he's trying to figure out Izuna's opinions on peace/alliance, since that's a thing Hashirama wants.

(But also yes, he feels very bad about giving away the healing jutsu thing and will try to apologize to Hashirama about it when he gets the chance.)

That works really well for the limits on Hiraishin! It did always seem odd to me that two unrelated people could use it but no one else. (Though for Typhoon Island it's just not invented yet, otherwise Tobirama could teleport off the island and we wouldn't have weeks of pining to inflict on them all.)

...are you trying to show off for the pretty guys, Tobira? >__>

XD Not quite yet! (I mean, he might have been trying with the first fish, but that was general pride + "see I am a Useful Ally, now how about we stop this whole 'war' thing".) With the second fish he's just very sneakily being a little shit, because he thinks them freaking out over An Ordinary Fish is funny. (And unimpressive. But he can judge them AND laugh at them just fine.)

(He won't admit it. But this is the Tobirama version of a prank.)

You're welcome, and thank you! I'm really enjoying getting to talk about all this.

@starstuffduster You are SO right about needing distractions, unfortunately I am working overtime so it will be even later than usual before I can write

(Do send me lots of asks though! I'm off tomorrow so I can write plenty then)

In the meantime, have a couple of incomplete later scenes from Typhoon Island (which will probably get rewritten but they're fun for now)

Hikaku finds Tobirama sitting under the ledge, where the rain is blocked but some light still filters in. His eyes are closed, and his face is perfectly blank as he traces ink blindly over his face and throat. A seal, clearly, though what it’s meant to do, Hikaku can’t imagine.

Tobirama is too skilled not to have noticed him, even rapidly bouncing his heel against the floor the way he seems to do when deep in concentration. How Tobirama managed to train his skills so that he is always aware of the people near him, but has missed sunrise, sunset, food placed beside him, and being rained on, all in the few weeks they’ve been here, Hikaku still hasn’t figured out. But a surprised shinobi reacts violently, and Tobirama is no exception, as proven by the times a sudden movement has startled him.

So Hikaku knows Tobirama is ignoring him for several minutes. As Tobirama is currently placing the most intricate seal Hikaku has ever seen on his own face, and doing it blindly, that’s more than reasonable.

Tobirama stops abruptly, his heel landing sharply on the stone. Hikaku doesn’t glimpse the handseal that pulls rain into a bubble over Tobirama. The bubble bursts and splashes over Tobirama’s face, blurring most of the seal and drawing the ink in distracting trails down his throat.

Hikaku sets that aside for later. “Difficulties with the seal?” he asks.

“Obviously,” Tobirama says shortly. He wipes some of the water off of his throat, smearing the sealwork there further.

Hikaku still doesn’t know whether Tobirama is aware of his own rudeness. He has learned that ignoring it is usually enough to end it. “Would a mirror help?”

Hikaku doesn’t have a mirror, and neither does Izuna. But they could probably work out something adequately reflective, if the seal is important.

“Hmm. Unlikely,” Tobirama decides. He unfolds from the rock he was sitting on and starts back toward the main cavern, and he’s still somehow taller than Hikaku remembers. “The seal is meant to be used in groups, applied to each other. The difficulty is in applying it backwards. Seeing it would likely be a distraction.”

Hikaku will never comprehend the Senju mind. “What sort of seal is it?”

Tobirama hums. It takes several seconds for him to answer, and they get close enough for Izuna’s voice to reach them, slightly distorted, singing a children’s training song. Several of the children have joined in, with a much larger range in skill than Hikaku expected children so old to have.

Mostly in the direction of less skill. Do other clans teach their children nothing except to fight?

“It is a snorkeling seal,” Tobirama says. “By drawing on the user’s chakra, it draws air from the surface into their lungs, and allows them to remain under water indefinitely.”

An incredibly useful seal, then. It would be a deeply concerning one as well, except that most of its uses are pointless in Fire Country. Fire Country has many streams and creeks, but even the Nakano, which is the largest river in the country, is only rarely deep enough for a person to truly hide in its depths. Mostly, a submerged shinobi would only look like a fool, trying to hide a few feet below the surface of clear water.

But in a place like Water Country, much less these Whirlpool islands… Hikaku is glad that the Uchiha so rarely venture outside of Fire Country.

Still, it gives him an idea. “If it is not given chakra, does it do anything?”

“No.”

“So it’s safe?”

The question earns a quick flick of Tobirama’s eyes in his direction, before they return to the tunnel ahead. “Children use it.”

“If you were to draw it on me, then,” Hikaku says, and even having concluded there would be no danger, his heart rate picks up, “Izuna could watch, and draw it on you.”

Tobirama pauses, a fractional delay in his steps as he glances in Hikaku’s direction again, this time longer, almost actually looking. But he shakes his head. “It is an Uzumaki seal.”

“I have not yet found a limit on the complexity of what the sharingan can copy,” Hikaku says.

“The Uzumaki are protective of their secrets.”

Ah. A different issue than Hikaku assumed. The Uzumaki are Senju allies, but it’s not a seal for war. “Is it that valuable? I can’t see it being used often in Fire Country. I’ve never seen a river or lake large enough to hide in.”

“Fire Country doesn’t have lakes; we only have ponds,” Tobirama says, as if reciting the opinion. “Every seal is valuable. If not for its own effect, then for what it will teach about sealing.”

“I see.”

Izuna stops singing the moment they reach the cavern, and most of the children break off after him, uncoordinated. Kagami continues alone, his voice clear until he finishes the verse.

“Izuna-san is teaching us Uchiha music!” [Uzukid] announces. Izuna’s face goes strained.

“Is it very similar to Uzumaki music?” Tobirama asks, apparently interested, which sets all the kids off. Uchiha music isn’t much like Uzumaki music at all; the [idk water bloodline] have some similar music but it’s not [waterkid]’s favorite; the Hyuuga have the same song, with only a few different words. Tobirama listens with solemn interest.

As soon as every child has shared their comparisons, Tobirama focuses on [Uzutween]. “[Uzutween], are you familiar with the snorkeling seal?”

She nods, looking slightly confused by the question.

“Good,” Tobirama says. “Come with me; I am going to use it to go fishing, and I am not able to apply it to myself.”

“Look! Abalone!”

[Uzukid] is grinning when Hikaku glances over, holding up a palm-length, brown shell with six holes in a line and oddly triangular spots. She, of course, is looking at Tobirama, who pauses in his demonstration of prying mussels off the rocks to seriously examine the shell she hands over.

“Very good,” Tobirama says, and hands the shell back to her. “Your family works with abalone, don’t they?”

“Yeah!”

Tobirama nods again, and turns to include the other children in his explanation. “We likely won’t find many abalone here, but they’re valuable and harmless, so collect any that you see. [Uzukid], would you like to explain how to identify them?”

“Yeah!”

The rest of the kids cluster around and [Uzukid] holds up the shell, pointing out the shape, colors, and shiny interior. The Uzumaki eat the snails, and make the shells into all kinds of jewelry and decoration.

Tobirama listens, but his eyes keep sliding away, scanning the pool and the area nearby. Izuna glances over, sharingan flicking on to catch the image of the abalone’s shell, and then goes back to hunting through a pool closer to the water. Hikaku listens while he keeps prying mussels off of stone and tossing them up the beach toward dry land.

The kids spread out again, now mostly ignoring the abundant mussels as they stick their faces in the water and peer under rocks in search of abalone. [Uzukid] turns rocks over a little more strategically, and keeps chattering. “An’ when you grind the shells up really good, you mix ‘em in with ink and make star seals! That’s what my family does, for the whole village!”

“What are star seals, [Uzukid]?” Tobirama asks.

“You’ve seen them! On the roofs!”

“I have, but not everyone here has,” Tobirama says. “Kagami, do you know what star seals are?”

“Not yet!” Kagami chirps.

“They’re sparkly! And bright!” [Uzukid] gestures, hands flying out in a burst of implied light. “We put ‘em on the edges of the roofs so the old shinobi don’t fall at night!”

[Uzukid]’s descriptions make it sound as if every day is a festival in Uzushio. It’s a shame, Hikaku thinks, that he won’t get to see it. But the Uzumaki have been the Senju’s allies almost as long as the Uchiha have been their enemies. Hikaku will no more be allowed to see Uzushio than Tobirama’s bedroom.

“What if they’re too bright?” Kagami asks.

“They’re not!” [Uzukid] declares indignantly. “They’re star seals, not… not sea-glare seals, or something!”

Kagami nods seriously.

“Seals that create a bright light as their primary effect are called flash seals,” Tobirama says.

“Yeah! They’re not flash seals!”

“But flash seals are one of the primary types of seal which Uchiha encounter,” Tobirama says. “So it’s reasonable for Kagami to think of them.”

“And fire seals,” Kagami adds.

“Explosive tags,” Tobirama corrects.

“Izuna-sama hates those,” Kagami shares. “He says fire’s ours so it’s not fair Senju can fake it without learning real jutsu.”

Tobirama smirks, a flicker at the corner of his mouth that vanishes before he raises his voice enough to make it carry. “Well, next time he says that, you may tell him that Senju use fire jutsu, too; he just hasn’t seen. And he should know better than to make assumptions like that.”

Kagami grins and nods. A few other children giggle.

Izuna looks thoroughly annoyed, but he turns away instead of saying anything. He’ll have plenty to say later, Hikaku is sure, once Tobirama and the kids are out of hearing, but for now he tosses his hair back and peers deliberately into the water.

“Are there lots of kinds of seals, Senju-sensei?” Kagami asks.

“More than I can list at once,” Tobirama says. “Seals are even more varied than jutsu, only less commonly used. Now, how many mussels have you found?”

The Uchiha are collectors of jutsu. Every jutsu that any Uchiha has seen since the beginning of the clan is recorded, both in written form and in memories passed down across the generations. Many of those jutsu are useless—there are dozens of campfire-lighting jutsu, invented by different clans in different countries and different generations, and the Uchiha only need one. But they are kept anyway, for any who want to study jutsu creation, or in case an Uchiha needs to disguise themselves as a member of another clan.

Among those jutsu are thousands that have no use at all in war. Jutsu to make food more flavorful, to shape wood and metal and stone with greater precision than a handheld tool, to send messages, to embellish dance, to amplify music or sensation. Most Uchiha learn a handful of them. Jutsu for singing and sex are the most popular, and those that are useful with various crafts. Hikaku has at least glanced through most sections of the library, looking for interesting options. Each recorded jutsu also records the source, and every Senju jutsu Hikaku has ever seen is for war. Hikaku used to be sure that meant the Senju simply didn’t know or use jutsu for anything other than battle, sabotage, and the like.

But once this season is over he’s going to have to go home and add an entire new section to the library for jutsu that heal. Not merely by shaping a needle out of a broken blade or pulling gravel out of wounds, but actively. It’s still technically for war, but it’s an entire category of jutsu that the Uchiha didn’t even know were possible, which the Senju seem to have been using for generations, the way Tobirama acted about it.

So maybe, being a Senju, Tobirama doesn’t know the full variety of uses jutsu can have. Or maybe the Senju are very good at keeping secrets, and seals can do things Hikaku hasn’t even imagined.

It really is a shame that he’ll never see the Uzumaki compound.

Hikaku pries the last mussel worth eating off the rocks, tosses it into the pile with the rest, and straightens. The children are enthusiastic, but very distracted by all the unfamiliar creatures in the pools, and Tobirama is similarly distracted by watching and teaching them all.

Hikaku and Izuna, then, will have to do most of the foraging. Which isn’t worrying, really; Hikaku is no longer concerned about starving while they’re trapped on this island. But he’d rather not eat every meal from the same single fish for a week again, nor would he like to see what bigger fish Tobirama could possibly find.

[this is followed by Hikaku picking up a blue ringed octopus, and Tobirama being Totally Rational And Calm And Not Panicking in response. As he always is, of course]

#typhoon island #not fic

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