When Luffy entered a ship that was under attack from Alvida's Pirates, he befriended poor Coby. Alvida forced Coby as her swabby after he got on her ship by accident. When Alvida attacked Luffy she was defeated with one blow and was sent flying.
That isn't the last time Alvida is seen, though. The next time is rather strange and odd. Alvida was never defeated by a man before and developed a crush on Luffy. She decided to hunt Luffy down with the power of the Slipslip Fruit or Smooth Fruit, a Devils Fruit that slimed her down. Not only that but nearly everything you throw at her bounces right off, and if she were to take her sandals off she would slide all over the floor.
After taking the fruit, she contacted Buggy, who was defeated by Luffy as well, and they agreed to an alliance. After some searching, Alvida and Buggy met with Luffy in Rogue Town where they were nearly defeated by the Navy. Only by the intervention of an unknown pirate who was wanted for the last 20 years saved both of them.
She follows Luffy and his crew into the Grand Line, searching for the man she loves: Luffy.
Express yourself! Post questions and comments in the AbAlvida is a female pirate, and is first mentioned in volume 1 of One Piece, and is in the first episode. She carries an iron mace. She is also mean to her cabin boy, Koby, and would have done away with him if Koby didn't knew so much about the sea.
Alvida gets defeated by Monkey D. Luffy, but she meets up with him again in Roguetown, the place where Gold Roger had said his last words. She ate a cursed fruit that changed her figure, which is why she looks different this time around.