Kazuo Jinjiiro is not a pleasant host. His curiosity about life leads him to preform magical experiments on the poor souls who wander into his lair. He is detached from most of everything, and doesn't consider himself to have any family.
In short: he seems to be a typical sociopath.
Though most of his distant attitude, curiosity, and air of uncaring is a facade.
He had a single son who he assumes is dead.
(I'll probably write more backstory/drabble stuff here later but for now- Enjoy this asshole.)