Spite looks a lot of Vile in terms of appearance. The only differences are a lopped-off horn on the left side of his head and slightly different colors for the eyes and skin. This was done since, in the earlier days of the Reincarnation series, the demons were drawn to look all the same.
Spite is rude and insults people on a regular basis. He's also known to steal, torture, and kill. Sometimes, he can be civil if he likes someone, but he'll still be rude to them from time to time. Unlike most demons, he likes to visit the human realm, mainly to get a good internet connection. He likes to play video games and watch violent shows while he's up there.