Because you like Scarlet Porter O'Donnell in 17 Again

Caleb Rivers is a bad boy with a good reason for acting out. See them in Pretty Little Liars.

Driven yet empathetic, Emily Prentiss brings humanity to the pursuit of inhuman killers. See them in Criminal Minds.

Sweet, reserved, and intellectual, Cordelia Foxx would do anything for her students. See them in American Horror Story.

Peter Venkman's "research" projects are designed to get undergraduate students to sleep with him. Though it turns out he can bust ghosts. See them in Ghostbusters.

Polite and clever, Annie James is not afraid to stir up a little mischief. See them in The Parent Trap.

Alex Russo desperately wants to keep her magic – after all, things are so much easier when you can just wave a wand. See them in Wizards of Waverly Place.

Jo Wilson is an accomplished doctor who's getting over her past. See them in Grey's Anatomy.

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.

Iris West is a barista and blogger determined to expose a secret. See them in DC Extended Universe.

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

Toby Cavanaugh has trouble avoiding being manipulated. See them in Pretty Little Liars.

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