Alvida

Luffy's first foe, a pirate who, after the Slip-Slip Fruit, became beautiful and allied with Buggy.

Alvida 'the Iron Mace', the cruel captain who kept Coby enslaved, was Luffy's first opponent; after eating the Slip-Slip Fruit she became smooth and alluring, joining Buggy in the hunt for the Straw Hats.