[@ghastlyInc]: Okay, um... You're underestimating how strong the Princes of Hell are, I think. Levi is physically the least durable and physically weakest Prince, and she can take a full-speed freight train to the face and not even get bruised. Also, demon regneration is based on a "reversion to a previous state". Their body reverses its personal time in order to completely negate injury by making it, effectively, never have happened. That's why it generally takes supernatural forms of harm to do damage, and holy items to completely outdo regeneration on some tougher demons(alternatively REALLY powerful spells work but that's on the really high end of demon power scales).

Demons are also a bit... um, how to put this... the divisions in their race are taken right out of the Ars Goetia and the Bible and stuff like that, I guess. The animal-trait demons are more unique. Beelzebub isn't an insect demon, she just has insectoid features in her antenna. Sheep demons wouldn't be a race, though that trait might end up in the child of a demon with such features.

Speaking of which, the child of a demon is always a demon even when they're born from a human-demon union, buuuuut the birthrates are extremely low.

Also, demon childhood is... weird. They're born and reality takes a bit to recognize they're a demon, but once that happens they just flat-out stop aging as their abilities really kick in. There's a reason Levi is a thousand years old and still looks like she's ten(though she's different then Sho would be given she's one of the originals).

On the bright side of things I don't think he's too weak offensively.

[@Jedly]: I mean I don't think they'd have been human. That being said, it's fairly easy to excuse them showing a clearly-magical human the Imaginary District as well. ^^;

[@Rin]: Of course you think that.