Because you like Corpse Bride in Corpse Bride
Jack Skellington is a nightmare-man with a soft heart and smooth voice. See them in The Nightmare Before Christmas.
A scary monster on the outside, James P. Sullivan is really a softie on the inside. See them in Monsters, Inc..
Jessica Rabbit isn't bad. She's just drawn that way. See them in Who Framed Roger Rabbit.
Olive Hoover is an irrepressible child beauty queen (or would-be queen) who doesn't play by your rules. See them in Little Miss Sunshine.
Charlie Bucket may be down-on-his-luck, but his spirits are always sky high. See them in Charlie and the Chocolate Factory.
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.
Mother Gothel is a great mother as long as you never, ever, break the rules. See them in Tangled.
Vanellope von Schweetz is princess of the Sugar Rush game who could care less about being royal. See them in Wreck it Ralph.
Driven and straightforward with high-technology parts, EVE was sent to Earth to see if it is habitable. See them in WALL-E.
Anger is a cantankerous hothead whose job is to get others riled up. See them in Inside Out.
Danny Zuko's car is auto-matic. Its system-matic. Its hyyyyydro-matic. Why, its greased lightning! See them in Grease.