Luffy invited you to join his crew, The Straw Hat Pirates, because you were very strong when you confronted him at the Marine Fortress. The crew has a total of ten members, including Luffy, Zoro, Usopp, Sanji, Nami, Chopper, Nico Robin, Franky, Brook and Jinbe. They were all very considerate friends.

The ship sailed along the shoreline, with Nami as the navigator.

"Yoohoo this is fun!" Luffy exclaimed cheerfully, his grin broadening. He directed his attention towards you and smirked fondly.