Because you like C3PO in Star Wars Series

Leonard Hofstadter is the normal one among his scientist friends, though in fairness that's a low bar. See them in The Big Bang Theory.

David Nolan is a noble fairy tale prince with the heart of a hero, regardless of whether he can remember his past or not. See them in Once Upon a Time.

Donkey is proof that if you're annoying enough you can change the world; he's the reason that his friend Shrek does, well, anything. See them in Shrek.

With her mastery of martial arts and her prodigious building skills, Wyldstyle projects an air of invincibility. But she's not bulletproof. See them in The Lego Movie.

Arwen has to choose between a life of loneliness or love and inevitible death, both rather unfortunate options. See them in The Lord of the Rings.

A meek schoolteacher, Mary Margaret Blanchard can't remember her past as a spirited, swashbuckling Snow White. See them in Once Upon a Time.

Dorothy Gale is a down-home Kansas girl in a bizarre fantasy land with beautiful red shoes. See them in The Wizard of Oz.

Rogue's touch is literally deadly, and she's trying to learn from the older mutants how to manager her powers. See them in X-Men Series.

Charlie is a Type A theater director dealing with something out of his control: a painful divorce. See them in Marriage Story.

Squidward Tentacles is a pretentious clarinet player in search of peace and quiet. See them in SpongeBob SquarePants.

No one has seen The Mandalorian without his helmet since he swore the creed. See them in The Mandalorian.