Ghost—?

[from the look on Killua's face, he Does Not Like That. back home, he doesn't really believe in ghosts.... but also somehow, is kind of scared of them anyway. he hates the idea of that.]

Oh, are they...? I mean, I don't really know about stuff like that, [Killua concedes, shoving his hands in his pockets.] If they're like regular animals, that's probably true. It's not the Pokémon's fault, in Guzma's case.

[Killua's expression suddenly snaps into something irritable, just thinking about it.]

Tch, it's like that dude was tailor made to specifically piss me off...