Chthon is a demon, which is a little unsettling. Not only are there normal bad guys with machine guns. There are also bad guys with super powers. Then you have to worry about celestial beings from different galaxies. As if all of that wasn't enough, there are demons as well. The heroes can't catch a break. You'd think that one mythos would break another one. For example, if there are beings from different galaxies, do they have their own demons? And I don't meant personal demons, like alcoholism.
Chthon was born on Earth with his sister Gaia, and his job was to be the first master of black magic. He kind of got set up to be evil with a job like that, didn't he? "That's my son, Chthon. He's a master of black magic... he's kind of a dick." It's like, what do you expect? It's like parents who name their kid Damian. That's an evil name.