Because you like Billy Costigan in The Departed

As high-strung as she is talented, Rachel Berry both marches and sings to the beat of her own drum. See them in Glee.

Princess Bubblegum is brilliant and determined, but can display a nasty temper. See them in Adventure Time.

Kumar Patel is always high, always hungry for sliders. See them in Harold & Kumar Go To White Castle.

Spencer Reid's super-smarts helps catch killers, and his social awkwardness endears co-workers. See them in Criminal Minds.

Nick Miller might not have a bank account, but he defintely has a lot of love to give. See them in New Girl.

Juno MacGuff is hoping sarcasm will get her through the stress of teenage life. And also, teenage pregnancy. See them in Juno.

Mario is a plumber who wears a ridiculous outfit, eats weird looking mushrooms, and fits himself inside your pipes so he can save a princess. See them in Super Mario Bros..

An all-business doc , Miranda Bailey dispenses tough love to the interns she trains. Emphasis on "tough." See them in Grey's Anatomy.

Britta Perry has never met a cause she couldn't passionately champion—at least for a little bit. See them in Community.

Closing off her emotions makes Lightning a great fighter, but at what personal cost? See them in Final Fantasy Series.

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.