Because you like Lisa Cuddy in House M.D.

Joey Potter is a low-key girl next door in love with her best friend. See them in Dawson's Creek.

This power-hungry Time Lord calls himself the "master of all." Bonus: he has 13 lives. See them in Doctor Who.

Arizona Robbins loves being a pediatric surgeon, and the cute orthopedic surgeon downstairs makes coming into work worth her while. See them in Grey's Anatomy.

Although she is underestimated, Lagertha never fails to prove her worth as both a warrior and a mother. See them in Vikings.

Protecting his family's name and its power are more important to Tywin Lannister than anything or anyone. See them in Game of Thrones.

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

Shawn Hunter may be a bit of a rebellious bad boy, but he has a heart that's pure gold. See them in Boy Meets World.

The seasoned detectives in River Heights have got nothing on amateur sleuth Nancy Drew. See them in Nancy Drew.

Raj Koothrappali is an astrophysicist who sees stars when he feebly tries to chat up women. See them in The Big Bang Theory.

Faith has a chip on her shoulder and a stake in her hand to slay vampires in her town. See them in Buffy the Vampire Slayer.

Izzie Stevens is a model-turned-med student who can do it all, even if people underestimate her. See them in Grey's Anatomy.

Jane Smith is a stone-cold killer, but you would never know it from looking at her. See them in Mr. & Mrs. Smith.