Because you like Julia Sullivan in The Wedding Singer

She's mostly doom and gloom, but you'd get nowhere without Sadness. See them in Inside Out.

Self proclaimed, Fat Amy, likes horizontal running and mermaid dancing. Important skills, one could argue. See them in Pitch Perfect.

Nothing instills more fear in the Empire than the deep kshhh of Darth Vader breathing through his helmet. See them in Star Wars Series.

WALL-E is a quirky little romantic robot cleaning the wasteland known as Earth. See them in WALL-E.

Percy Jackson is an ordinary student thrust into the world of myth come alive. See them in Percy Jackson & The Olympians: The Lightning Thief.

Socialite-turned-runaway-turned-waitress, Rachel Green is the legendary story of riches to rags, trying to work her way up again with the help of her friends. See them in Friends.

Tony Stark's interests include cocktails, beautiful women, particle physics, and saving the world. See them in Marvel Cinematic Universe.

Steve Rogers is a good soldier. But above all, he's a good man. 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.

Dipper Pines is investigating a truly strange town during the world's wildest summer vacation. See them in Gravity Falls.

A superpowered test subject, Scarlet Witch can manipulate other people's thoughts and force them to confront their worst fears. See them in Marvel Cinematic Universe.

Damon Salvatore used to miss being human. Now he can't think of anything more miserable. See them in The Vampire Diaries.