Because you like Ishmael in Moby Dick

Aang is already a master airbender and once he learns to manipulate water, earth, and fire, he'll be truly unbeatable. See them in Avatar: The Last Airbender.

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.

Brilliant, violent, and only a little insane, the Joker doesn't listen to anyone except the voices in his head. See them in DC Extended Universe.

Chaos is what killed the dinosaurs, and there's nothing Jason "J.D." Dean loves more than chaos. See them in Heathers.

Don't underestimate Maggie Greene. She's a farm girl with a mission. See them in The Walking Dead.

For the sake of science, Kurisu Makise will persevere no matter how deep into the dark secrets of the world she finds herself. See them in Steins;Gate.

Bedside manner is for chumps, not the brilliant Dr. Gregory House. See them in House M.D..

Impassive, overly literal, and a little short on people skills, Angel dedicates her life to enforcing the rules. See them in Angel Beats!.

Tonya Harding has been shoved around her whole life. She just wants to feel free. See them in I Tonya.

Hannah Horvath is kind of a mess, but she owns her messiness in a way few people do. See them in Girls.

Cynicism is his armor and words are his weapons, but what Tyrion Lannister would really like is some nice wine. See them in Game of Thrones.