>>49430915
Good question, m8

Urumi in particular seems to be nostalgic of those times, however. It's akin to a viking missing the times when he was a ferocious warrior and went around killing others like him, and sacking villages. It's difficult for more tame people like us to understand that, but its something that cannot be explained through reason. I guess that this is the case for youkai like Urumi.
>so I don't think they have perfect memories or mature over time like humans do.
The other way around: They have seen so much, experienced so much, that anything at this point is just another day for them, so they act aloof and uncaring. While humans are fragile beings, so every success is as glorious as the heavens, and every failure seems like the end of everything for them. As a species, humans are like excitable kids/early teens, while youkai and superhumans such as magicians and hermits are like chill middle aged/ old folks, knowing that everything, good or bad, will come and pass by like everything else at this point