The below description is taken from LEGO.com.
Gorilla Suit Guy
The Gorilla Suit Guy is a mystery. Who is he? Why is he wearing that suit? Does he think he’s an actual gorilla, or did he get lost on his way to a costume party? He certainly acts like the real thing, or at least like someone who’s watched a lot of old movies and TV shows and thinks that’s how a gorilla should act. And he sure is wild about bananas.
The Gorilla Suit Guy could turn up anywhere. In the park, at the beach, hanging out in a store window or jumping up and down on a trampoline, he tends to pop up in the most surprising and unlikely of places. And while he may not be a real gorilla, somehow no one ever wants to be the one to tell him that!