Because you like Gilderoy Lockhart in Harry Potter Series
Anakin Skywalker is said to be the chosen one, who will destroy the evil Sith. But he struggles with Jedi ideals as he grows in power. See them in Star Wars Series.
Tony Stonem is the golden boy of Bristol. Problem is, he knows it. See them in Skins.
In the simplest terms, in the most convenient definitions, people consider Brian a nerd. But he's more than that. See them in The Breakfast Club.
Catwoman might be slightly unhinged, but you can't say this feline villainess isn't confident. See them in DC Extended Universe.
Aldo Raine is in the killing Nazi business. And as he says, business is a-boomin'. See them in Inglourious Basterds.
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.
A compassionate medical student, Martha Jones has found a Doctor she can really look up to. See them in Doctor Who.
Tina Cohen-Chang is a shy loner who becomes a fierce performer on stage. See them in Glee.
Kesuke Miyagi is a karate expert who thinks the best way a scrawny high schooler can learn how to defend himself is by washing every surface in sight. See them in The Karate Kid.
Stanley Barber is a loveable goofball with impeccable (if eccentric) fashion sense, unique music taste, and a wealth of strange but useful knowledge. See them in I Am Not Okay With This.
Woody is a selfless leader of Andy's toys who likes change less than a snake in his boots. See them in Toy Story.