Source: totalcomicmayhem.com

5. Kevin

(Sin City, Dark Horse Publications)

Oh, God, why.

Kevin scares the heck out of me. Sin City remains fairly hit or miss (leaning more toward miss the farther you get into it), but Kevin is one of its most enduring antagonists. Kevin is one of the comic book world’s scariest serial killers, and cannibal at that who prefers prostitutes as targets. He's also terrifyingly fast and strong, and is more than a match for Basin City's most fearsome fighters.

He also, like, doesn't seem to feel pain. Which is deeply unsettling. More unsettling in the movie, because Elijah Wood can be shockingly creepy when he wants to be. In the story, Kevin murders Goldie, a prostitute whose last action is to show kindness to Marv, Sin City's resident sad lump of scar tissue and growling. Marv tracks Kevin down and cuts him into pieces before feeding said pieces to wolves. You know, good family fun.

Plus, one hell of a villain for the first Sin City arc.