[Shun'ya watches him keenly, absorbing every world with a quiet focus that's pretty similar to being stared down by a tiger in pouncing position. The friendly smile didn't leave his face though which... probably just made the whole thing uncanny, thinking about it.]

Hmm... interesting.

[He says once he's sure Minato had finished. He taps a finger against the hilt of his tanto. Considering.]

Demons do indeed come from human emotion, though that's a gross oversimplification. Demons are born from a myriad of factors, but it all really does boil down to humans in the end, huh...

[He chuckles.]

We're the source of our own misery, really... anyways. "Persona". I'm unfamiliar with that term. Mind elaborating?