Because you like Steven Hyde in That '70s Show

Jack Bauer is a terrorist fighter who is scared of nothing and no one. The clock is ticking! See them in 24.

M. Bison is a diabolical megalomaniac hell-bent on dominating the world. See them in Street Fighter.

Ava may just be the perfect woman. So long as she can pass a Turing test. See them in Ex Machina.

Tiffany Doggett is usually a nice, good Christian. Just don't get her riled up! See them in Orange Is The New Black.

After being resurrected and discovering his new morphing abilities, Alex Mercer uses them to combat the virus now ravaging New York. See them in Prototype Series.

Although Jareth seems like he's just a harmless romantic, his powers make him a formidable foe. See them in Labyrinth.

More of a sex symbol than a crime-stopper, the original Silk Spectre has now become the ultimate superhero stage mom. See them in Watchmen.

It turns out Dracula's son Alucard has some pretty severe daddy issues. See them in Castlevania.

Jason Bourne is suffering amnesia, but considering what he's done as a CIA assassin, maybe that's for the best. See them in The Bourne Identity.

It’s usually the good-looking, charismatic, play-by-their-own-rules types that get everyone into trouble, and Tyler Durden is Exhibit A. See them in Fight Club.

Usagi Tsukino may look like a lazy teen, but when Usagi conjures up her alter ego and calls her Sailor Scout team, no villain stands a chance. See them in Sailor Moon.

After Rintarou Okabe develops the Phone Microwave, some of his fantasies start to seem uncomfortably real. See them in Steins;Gate.