Because you like Gimli in The Lord of the Rings
Aslan represents everything good and just, he's just not super reliable. See them in The Chronicles of Narnia.
A cursed pirate captain, Barbossa is greedy, vengeful, and surprisingly cheeky. See them in Pirates of the Caribbean: the Curse of the Black Pearl.
Peter Pevensie shows as much courage as a child king as he did under The Blitz of London. See them in The Chronicles of Narnia.
A stylish agent, Agent J would rather improvise than play by the rules. See them in Men in Black.
K-2SO is a blunt and sarcastic reprogrammed Imperial droid who is always up for an adventure. See them in Rogue One.
Hank McCoy is a quintessential nerdy scientist but with a few rather unconventional physical attributes. See them in X-Men Series.
This elf loves smiling, eating sugar, and spreading Christmas cheer. And no matter what, Buddy always sees the best in people. See them in Elf.
Dash Parr's super speed helps with his impatience. See them in The Incredibles.
Javert is an inspector with a single-minded focus: to bring criminals to justice. See them in Les Miserables.
Morpheus is wise enough to see into the bones of the world. See them in The Matrix.
There's more to this sweet, caring landlady than meets the eye. See them in Sherlock.
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.