[oho, what's this? He really isn't one to tease about this sort of thing, but rather stores it away as more interesting things about the humans he's decided belong to him.

It's unfortunate Childe's endeared himself so much to Baku. Mostly fortunate, but also unfortunate]

It might be. You mentioned Inazuma too, right? That's the word for "lightning" in Japan, where I live now. The parallels are interesting.