Jinbe

Jinbei (ジンベエ) was the former captain of the Sunny Pirates before he became a Shichibukai 8 years ago.

Powers and Abilities
As the former captain of the Sunny Pirates along with the fact of being among the Shichibukai ranks, Jinbei is presumed to be a fish-man pirate of immense power, possibly one that goes well beyond other fish-men. While the extent of his abilities has yet to be seen, Sengoku mused about how the fish-man's great power would be a mighty asset for the marines in the upcoming battle with the Whitebeard Pirates.

Past
Jinbei was the most recent leader of the Sunny Pirates, taking over a legacy begun by Fishman pirate Fisher Tiger. When Jinbei joined the Shichibukai, the group split into pieces, such as the one Arlong led out of the Grand Line in search for easier targets.

Current Events(Spoilers)
At this time, Jinbei is corrently in Impel Down, the only member of the Shichibukai who has chosen not to follow with the World Government on their summons on facing the Whitebeard Pirates. He apparently has decided to fight the Marines and is prepared to lose his status as a Shichibukai.

Trivia

 * Jinbei is speculated to be a Whale Shark fishman, as 甚平鮫 jinbei-zame means "whale shark" in Japanese.
 * Although Jinbei is the second Shichibukai mentioned, as of yet, he is the only unrevealed member of the group. A silhouette of him was shown recently and depicts him as a wide-bodied Fishman with what appears to be wild, wavy hair.