Alvida

Alvida is first introduced in the first episode of One Piece as a fat looking female pirate captain with freckles all over her face. Coby, a pink coloured hair boy works for her after he was captured by Alvida. She was often seen asking the quote 'Who is the most beautiful woman in the world?', and expect an answer of her name to anyone she ask regarding the question.
After Alvida and her crew was defeated by Luffy, she ate the Sube Sube fruit (Smooth Smooth) that allows incoming attacks to slip through her. Her freckles also disappeared after she ate the fruit. Aside that, her figure also changed for some reason. At her second appearance in the 46th episode, she is now portrayed as an attractive beauty.

After her defeat by Luffy, Alvida ends up joining forces with Buggy to take revenge on their common foe, staying on Buggy's ship all the while. She also takes charge of Buggy's crew for a while, in the short time that Buggy was captured by the Marines.