Because you like Luigi in Super Mario Bros.
Wheatley's got an endless supply of bad ideas that he wants to share. See them in Portal Series.
Not only could Hellboy avenge your death, he'd also have a sense of humor about it and not let it ruin the rest of his night. See them in Hellboy.
Francis Freeman may be impervious to pain, but he sure knows how to inflict it. See them in Deadpool.
Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.
After Otto Octavius' accident, he becomes fixated on finishing the reactor at any cost. See them in Marvel Cinematic Universe.
A level-headed show business icon despite his amphibian status, Kermit is the brains behind the success of the Muppets. See them in The Muppet Movie.
Rhodes has to trust his conscience to guide him through a political struggle that could change the very shape of modern warfare. See them in Marvel Cinematic Universe.
His superiority complex coupled with his bitter desire for revenge makes Vegeta a formidable foe. See them in Dragon Ball Z.
Patrick Star enjoys life's simple pleasures because he can't wrap his brain around anything more complicated. See them in SpongeBob SquarePants.
Emmet Brickowski is so upbeat it's not even human. Everything is AWESOME! See them in The Lego Movie.