Because you like Granny Weatherwax in Discworld

John Watson is haunted by his past (who isn't) but he's starting to branch out with some help from a world class detective. See them in Sherlock.

When the going gets tough, Rick Grimes gets tougher. It's a very useful trait when the world goes to hell. See them in The Walking Dead.

Academics weren't his strong suit. Luckily, Jesse Pinkman's street smarts are a cut above the rest. See them in Breaking Bad.

Steven Universe is an excitable youth who likes junk food and trying to save the world. See them in Steven Universe.

While he might be too cool for school, Soul isn't too cool to do the right thing. See them in Soul Eater.

A daring conman, Flynn Rider is so charismatic that you might not mind when he steals from you. See them in Tangled.

Marty McFly is a skateboarder, aspiring rock star, and reluctant time-traveler. See them in Back to the Future.

If you hang out with Bender in cool dive bars in 31st century New York, make sure you're on his "Do Not Kill" list. See them in Futurama.

L is enigmatic, child-like, and one of the smartest people in the world. See them in Death Note.

Tina Belcher is on the cusp of puberty, and she has no shame when it comes to boys, butts, and brassieres. See them in Bob's Burgers.

The star of every school production since kindergarten and the most popular girl of East High, Sharpay Evans usually gets her way. See them in High School Musical.