Because you like Princess Fiona in Shrek
Although Jareth seems like he's just a harmless romantic, his powers make him a formidable foe. See them in Labyrinth.
A photographic memory is just one of many skills Lexie Grey brings to the table as a surgeon. See them in Grey's Anatomy.
It turns out the girl of your dreams just might have dreams of her own. See them in (500) Days of Summer.
His superiority complex coupled with his bitter desire for revenge makes Vegeta a formidable foe. See them in Dragon Ball Z.
After alien Haruko rides in on her Vespa, giant robots spouting from Naota Nandaba's forehead soon become the least of his worries. See them in FLCL.
Usagi Tsukino may look like a lazy teen, but when Usagi conjures up her alter ego and calls her Sailor Scout team, no villain stands a chance. See them in Sailor Moon.
An escaped convict on a mission, Sirius Black is brooding, brave, and reckless. See them in Harry Potter Series.
Finn is the world's last human who's "all about" understanding right and wrong. See them in Adventure Time.
Clementine is a beacon of innocence in a dangerous, deadly world. See them in The Walking Dead (Video Game).