Wapol is the former King of the Drum Kingdom which was originally named Drum Peak on the mountain that supports the kingdom. He had been a pirate since his kingdom was attacked by Kurohige and his men. He is an antagonist at the Drum Drum Kingdom and One Piece Movie 9.
Appearance
Wapol looks like an overweight man with a strange appearance. He has a cylindrical jaw made of tin plate, which is why he got his nickname. When Wapol used his Slim-Up technique he was like "eating" his own body, and immediately became slim. During the Drum Island Arc, Wapol used a tin-plated armor and a robe made of Walkie white leather. He also wore thick brown gloves. He was seen wearing a pair of purple and orange wool shorts and a brown belt at the waist and a pair of thick short boots. When he was still the ruler of Drum Peak, he wore the same clothes but there were additional armor plates in his clothes. Instead he wears a gray shirt and gloves without fur at the ends.
After time skip, as the King of the Kingdom of Black Drum he looks different clothes. He wears a different shirt that looks up to the bottom of his body, he wears a skirt with a black pattern, a pair of sharp-pointed sandals. He still has a hooded robe that he used before and he wears black gloves. Her hair is now white and her face has been grown with a black mustache and a beard.
Source : WIKIA ONE PIECE