Green and Mean

Western Animation

 * On The Powerpuff Girls, the girls' arch-enemy, Mojo Jojo, has green skin. There's also the Gangreen Gang. Buttercup wears green and is the meanest of the three.
 * On Laff-A-Lympics, green is the Really Rottens' team color. Besides that, Dread Baron wears a green military uniform.
 * Steven Universe: Peridot is a green alien who started as an antagonist. Even after Peridot's Heel–Face Turn, she maintains a snarky, slightly egocentric personality.
 * If not for their green skin, it'd be hard to tell that both the Creeper and Hyde from Scooby-Doo, Where Are You! are passing themselves off as villainous monsters, not just mean ugly men.
 * Subverted with Amity in The Owl House, who is initially presented as a green-haired Academic Alpha Bitch. However, as the first season goes on it becomes clear that both her hair color and her attitude are things that were forced on her by her parents and that her true self is actually a much sweeter brunette.