The entirety of the cast of the Twisted Metal games. (Outside of the ones from 3 and 4)
Terry Bogard, Mai Shiranui (heh), Joe Higashi and Geese Howard from Fatal Fury
Iori Yagami, K' and Krizalid from King of Fighters
Sgt. Cortez from TimeSplitters. (It's time to split! *crickets*)
Ed, Rolf and Sarah from Ed Edd N' Eddy
Ash from the Evil Dead/Army of Darkness movies
Pinhead from Hellraiser
The Joker, The Riddler, and Two-Face
Carnage and Venom from the Spiderman comics. (Carnage doesn't get featured enough nowadays)
And last but not least, Spawn.
There are more, but I'm feeling lazy, so I'll post them later or something.
If dysfunction were a hammer, I'd be hitting myself with it.