We do, but I don't think the evil really transfers. And Elsword hasn't exactly eaten any of our enemies. Even Ms. Demon hasn't, which I'd expect from demons, honestly.

[Ain: Ciel and Lu are my friends :)
Also Ain: the most racist shit you've ever heard]

There are lots of people we've defeated in a fight that haven't died and decided to be on our side, too. Like Mr. Dog.