Because you like Artemis Fowl in Artemis Fowl
The vampire that killed Zero Kiryu's family also infected him, and he starts to crave blood, much to his horror. See them in Vampire Knight.
Although she's the queen of killer comebacks and one-liners, Janis Ian is honest about her feelings and cares deeply about her friends. See them in Mean Girls.
Underneath his preening narcissist exterior, Schmidt is, well, still kind of a preening narcissist. But he has a good heart too. See them in New Girl.
Yuri is living in the afterlife, which takes the form of a high school where no one dies. But if you follow the school's rules and live a "normal" life you vanish. See them in Angel Beats!.
Everything is fascinating to Octavia Blake who has been locked away for her entire life. See them in The 100.
Timid and a bit insecure, Amy Antsler has big dreams of activism and meeting new people. She's learning it's easier said than done. See them in Booksmart.
Kyle Broflovski is an motional fourth-grader who plays Guitar Hero, speaks Pig Latin, and fights with his "Fat Ass" friend Cartman. See them in South Park.
Kenny McCormick is a boy of few words who likes nudie mags, NASCAR, monster trucks, origami, and Peruvian pan flute bands. See them in South Park.
Jo Wilson is an accomplished doctor who's getting over her past. See them in Grey's Anatomy.
Eren Jaeger will erase the Titans from this world until not a single one remains. See them in Attack on Titan.
Toby Cavanaugh has trouble avoiding being manipulated. See them in Pretty Little Liars.