Bigbottom (Empath stories)

Bigbottom is a character who is part of the EMPATH: The Luckiest Smurf story series. He is the cousin of Bigmouth, who is so named because of his big butt, which makes it rather difficult for him to maintain his physical balance before gravity forces him to sit -- which for Smurfs ends up being either right on them or their houses. Empath met Bigbottom a few years after his final return from Psychelia.