Because you like Hikaru Sulu in Star Trek
Victor Frankenstein can create life, so he's pretty awesome if he says so himself. See them in Frankenstein.
Aslan represents everything good and just, he's just not super reliable. See them in The Chronicles of Narnia.
N'Jadaka is a righteous man with a violent agenda. See them in Marvel Cinematic Universe.
A jazz musician, Sebastian Wilder is passionate about his music and his life. See them in La La Land.
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.
A sarcastic and nosy tomboy, Stephanie Tanner is understandably not crazy about being the middle child. See them in Full House.
A monstrous pirate captain, Davy Jones is quite literally heartless. See them in Pirates of the Caribbean: the Curse of the Black Pearl.
Burton Guster is a level-headed investigator with a "Super Sniffer" nose. See them in Psych.