Because you like Sam Carmichael in Mamma Mia!

Aang is already a master airbender and once he learns to manipulate water, earth, and fire, he'll be truly unbeatable. See them in Avatar: The Last Airbender.

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

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

L is enigmatic, child-like, and one of the smartest people in the world. See them in Death Note.