Since Monkey D. Luffy first formed the Straw Hat Pirates by joining forces with Roronoa Zoro, his crew has steadily grown into one of the most important groups in One Piece history. After departing the East Blue, the Straw Hat Pirates immediately took down a Warlord of the Sea, setting the tone for their disruptive exploits over the following years.
Source：https://www.cbr.com/one-piece-every-time-straw-hat-pirate-left-crew-why/
