Because you like Frederico Diaz in Six Feet Under

Samantha Jones is a try-sexual who'll try anything once. See them in Sex and the City.

Jenny Flint is a devoted wife and daring crime fighter, which is pretty unconventional for a Victorian maid. See them in Doctor Who.

Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.

You wouldn't know it by looking at her, but beneath Sheila Jackson's sweet, motherly exterior lies a sex addict. See them in Shameless.

Leone Montana is a fearless hitman with a surprisingly sensitive side. See them in Leon: The Professional.

It's impossible to say whether Winifred Burkle is cuter than she is smart, or vice versa. See them in Angel.

In Ziva David's world, you grow up fast; you don't have a choice. See them in NCIS.

Phoebe Halliwell is a bestselling author and martial arts master with power of premonitions. See them in Charmed.

Sydney Bristow is a kick-ass double agent on a mission for revenge. See them in Alias.

Kilgrave is a domineering, abusive boyfriend. Then, add in the power of mind control. See them in Marvel Cinematic Universe.

Anya Jenkins has a real harsh bark to go with her demonic bite. See them in Buffy the Vampire Slayer.

Helena is a mentally unstable, childish, and completely merciless. And most of all, she's an unstoppable killer. See them in Orphan Black.