Because you like Mike O'Donnell in 17 Again

Caitlin Snow believes that burying herself in science is the best way to save the day or to mend a broken heart. See them in DC Extended Universe.

The brilliant Mona Vanderwaal is proof that undergoing an "extreme makeover" isn't always a good thing. See them in Pretty Little Liars.

Nate Archibald is confident, shrewd and trying to do the right thing. But that isn't always easy on the ruthless Upper East Side. See them in Gossip Girl.

Felicity Smoak is a brilliant hacker who nonetheless becomes tongue-tied in front of attractive men. See them in DC Extended Universe.

Much more than just "Coach Taylor's wife," Tami Taylor is making herself known in town as a caring, persistent guidance counselor. See them in Friday Night Lights (TV).

White Witch's heart is as frozen as the land she rules. See them in The Chronicles of Narnia.

Harrison Wells is a brilliant scientist full of secrets. See them in DC Extended Universe.

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

Mark Sloan is the best plastic surgeon and biggest playboy the hospital's ever seen. See them in Grey's Anatomy.

Blaine Anderson is a put-together prep school boy with the voice of an angel. See them in Glee.

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.