Because you like Brandon Teena in Boys Don't Cry
Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.
After Otto Octavius' accident, he becomes fixated on finishing the reactor at any cost. See them in Marvel Cinematic Universe.
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.
He's an eccentric pirate making it up as he goes along. He's Jack Sparrow, savvy? See them in Pirates of the Caribbean: the Curse of the Black Pearl.
With his own ship, Peter Quill calls his own shots, and gets to fly from planet to planet blasting '70s pop hits and picking up alien chicks. See them in Marvel Cinematic Universe.
Her interests include martial arts, interrogation, and hacking. Natasha Romanoff is the ultimate spy. See them in Marvel Cinematic Universe.
The quiet, intense Daryl Dixon lets his crossbow do the talking. See them in The Walking Dead.
Fiona Gallagher wants to be able to give her siblings everything that they deserve because her parents aren't going to do it. See them in Shameless.
A grumpy tourist trap owner, Grunkle Stan has a few deep secrets. See them in Gravity Falls.
Lelouch vi Britannia is a high school student by day, masked destroyer of tyrannical empires by night. See them in Code Geass.
A vain and arrogant womanizer, Roy Mustang has hidden depths. See them in Fullmetal Alchemist.