Jinbe

The Arlong Pirates used to be part of Jimbei's crew, but when he left to become one of The Shichibukai they split up for as of yet unknown reasons. Although Arlong was referred to as Jimbei's equal, the odds of one of The Shichibukai being equal to a pirate with a bounty of 20,000,000 belli is very unlikely. It is therefore speculated that Arlong was Jimbei's equal before he left or that it refers rank is based on his growing up with Jimbei on Fish-man Island and not on actual strength. He is speculated to be a Whale Shark fishman, as 甚平鮫 jinbei-zame means "whale shark" in Japanese.