Because you like Leonard Hofstadter in The Big Bang Theory

Effy Stonem is cool and collected with a wry smile on her face and a cigarette between her lips. See them in Skins.

A premier member of the leather cat-suit club, Selene can chill you with a stony look, or ice you with her ninja moves. See them in Underworld.

Roman Roy is an entitled rich boy, but he's smarter than he seems. See them in Succession.

A star student destined for Princeton, nerdy Devi Vishwakumar dreams of losing her virginity to a stone-cold hottie who can "rock her all night long." See them in Never Have I Ever.

Castiel might be an immortal angel, but the human world is still more than a little confusing. See them in Supernatural.

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.

Even with the world on the line, Bayonetta is an Umbra Witch who maintains a biting sense of humor. See them in Bayonetta.

Charming and enigmatic, Amy Dunne takes her love for puzzles to a cunning new level. See them in Gone Girl.

Just call Jeff Lebowski The Dude. Or His Dudeness, Duder, or El Duderino if you're not into that whole brevity thing. See them in The Big Lebowski.

Sarah Kerrigan is pretty much the Queen Bitch of the Universe. See them in StarCraft .

Poison Ivy is a seductive, venomous botanist laments the fact that there are so many people to kill, yet so little time. See them in DC Extended Universe.

Eren Jaeger will erase the Titans from this world until not a single one remains. See them in Attack on Titan.