Because you like Rory Williams in Doctor Who
Ted Logan wants to party on, but if doesn't get an A+ on his history presentation, he'll flunk out and be sent to a military school in Alaska. See them in Bill & Ted's Excellent Adventure.
Where Ash comes from, food and shelter pay for themselves. Even as a penniless vagrant, he is able to pursue his dream of becoming a Pokémon Master See them in Pokemon.
Whatever Sakura Haruno lacks in power, she makes up for in intelligence and bravery. See them in Naruto.
John Bender's interests include marijuana, fighting, and breaking the rules. See them in The Breakfast Club.
Moving is hard for Coraline Jones; accidentally moving to a creepy mirror world just makes it harder. See them in Coraline.
Elaine Benes is a tough New Yorker who can hang with the guys, and date the ones who are "sponge-worthy." See them in Seinfeld.
Ichigo Momomiya is a bubbly student by day, magical cat-powered superhero by night. See them in Tokyo Mew Mew.
A Washington DC fixer, Olivia Pope can make roadblocks disappear with a single phone call. "It's handled" is her life motto. See them in Scandal.
Cady Heron is the new girl in town who's also new to the world of high school, period. See them in Mean Girls.
Aldous Snow is a rock star who plays hard and parties harder. See them in Get Him to the Greek.