"So many! A lot of Hell's niceness might hinge on everyone there being a demon."

"I can see that very easily."

"Oh?"

He shrugs. "It's usually nicer to be around shinobi if you're one yourself. I imagine the contrast being starker when you're used to a framework where your neighbor being clumsy with their experiments is merely rude, not potentially deadly."

"Yeah, the worst it gets is lost pets."

He nods. "Interdimensional travel won't be my first priority, besides."

"What is?" (The leaf continues to waft up and slurp down.)

"Research-wise, improving the resurrection. Currently it's not very useful for, for instance, returning children, and some people might find these bodies unpleasant."

"What would stop it from being used for children? They wouldn't grow?"

He nods. "These bodies can't change. I might be able to manually age one, but that won't scale."

Cam nods. "I mean, if there's an expectation of being able to solve that on the horizon it might still be preferable to just leaving the kid dead in the interim but only if we wind up with such a volume of people performing resurrections that it's no big deal to do some that will need re-doing."

"Traditionally, we don't consider our dead to be suffering, and I would prefer a peaceful world first for at least the children I'm thinking of. The resurrection technique - for those without a perfect memory - would require years' worth of familiarity with sealing to perform safely. We can likely cut that short by favoring Uchiha in any early waves; their memory is one of their notable traits."

"Nice feature if you can get it. Isn't it possible that improved versions might be easier as well as improved along other axes, or are the other axes likely to trade off directly against ease?"

"They're likely to trade off against ease, though long-term I might be able to re-simplify the technique."

Nod nod. "Okay, we can start with some Uchiha. If they're liable to be helpful, anyway, as opposed to preferring to brood on having been genocided, which would be understandable but not exactly progress."

"I can name a few from my time, including one of my students. I'm unsure about more modern Uchiha, and if Sasuke would be accurately able to identify relevant personality traits, given his age at the time of the massacre."

"And Itachi's a nutcase apparently so I don't anticipate much help from that quarter. But even ones you knew might be upset about the later genocide."

"Yes. I think my student specifically would set that aside, but many would not."

"It's an upsetting thing, especially with the guy who apparently covered for it walking around over there." He waves vaguely at Hiruzen's apartment.

"I am surprised Sasuke did not dismiss him. There are other ways to keep a soul from being resurrected by someone else."

"There are?"

"The Death God's seal is the most obvious. But souls can be bound insensate to an object, or this specific technique can be used to keep someone summoned and bound but inactive."

"Yeah-huh. It speaks well of Sasuke, I suppose."

He nods. (He doesn't like how Sasuke ignores damage to himself, but, well, it's hard to be a shinobi without being a little fucked up.)

"It does enable us to at least ask Saru questions."

"Which could come in handy." Leaf waft. Leaf stick.