Jinbe

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

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, Arlong was allowed to split from the group and along with his own "Arlong Pirates", left the Grand Line for easier targets.

Current Events(Spoilers)
At this time, Jinbei is headed towards 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.