Because you like Xander Harris in Buffy the Vampire Slayer
Angela Martin is uptight and puritanical, outside of the affair she's having with a co-worker. See them in The Office.
Rose Tyler may have not done too well in school, but she's certainly holding her own in space. See them in Doctor Who.
Leslie Burke is bold, courageous, and imaginative enough to create a world from scratch. See them in Bridge to Terabithia.
Polite and clever, Annie James is not afraid to stir up a little mischief. See them in The Parent Trap.
Mother Gothel is a great mother as long as you never, ever, break the rules. See them in Tangled.
Nicholas Angel is super-dedicated to his job as a police officer. Maybe a little too dedicated. See them in Hot Fuzz.
Christine Daae has been secretely taking lessons from a phantom musician. It sounded less creepy in her head. See them in The Phantom of the Opera.
Marshall Eriksen is a lawyer in love who is enjoying life. See them in How I Met Your Mother.
Leone Montana is a fearless hitman with a surprisingly sensitive side. See them in Leon: The Professional.
This cannibalistic villain may be a loner, but Killer Croc doesn't have problems with self-confidence. See them in Suicide Squad.
How lucky are we that Arthur Curry, the King of Atlantis, hasn't taken over the surface world? Very! See them in DC Extended Universe.
This power-hungry Time Lord calls himself the "master of all." Bonus: he has 13 lives. See them in Doctor Who.