Because you like Brittany Pierce in Glee
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.
His superiority complex coupled with his bitter desire for revenge makes Vegeta a formidable foe. See them in Dragon Ball Z.
A deadbeat dad and small-time con-artist, Frank Gallagher gives nothing and yet expects everything. See them in Shameless.
Konata Izumi has a live-now, worry-later view of the world. See them in Lucky Star.
When Rin Matsuoka is not swimming, he mostly spends his time brooding or listening to angry Dubstep. See them in Free! Iwatobi Swim Club.
Fox McCloud leads a team of pilots through the Lylat System in search of the evil genius Andross, the villain that killed his father. See them in Star Fox.
Hans Landa doesn't seem to have issues with Jews, but he hunts them because he's determined to do his job well. See them in Inglourious Basterds.
Vengeance is William Wallace’s game. With his father, brother, and wife killed by the English, he slaughters the garrison and sacks cities. See them in Braveheart.
There's no obstacle too great for this charismatic treasure-hunter. See them in Uncharted.
Raised to happily follow the rules, Cassia might actually be more rebellious than she thinks she is. See them in Matched .
With a unique ability to empathize with killers, Will Graham helps society but his sanity pays the price. See them in Hannibal.