Tsuru

Vice-Admiral Tsuru (つる中将 Tsuru Chūjō) the "Great Tactician" is one of Sengoku's direct subordinates at the base in the Sanctuary of Marie Joie. She is an elderly woman, similar in appearance to Dr. Kureha, but older-looking (and probably younger).

Jaya arc
She was present for the gathering of the Shichibukai to choose a replacement for Crocodile.

Marineford arc
She was next seen in Chapter 550 at Marineford, saying comforting words to Garp concerning the upcoming execution of Portgas D. Ace. Then when Whitebeard arrived she commented on the illogicality of his position, and faced along with the other Vice-Admirals when Whitebeard's division commanders began their attack. Although Vice Admiral Yamakaji expressed concern for her safety during the attack, Tsuru stayed at the front lines, stating that she was as safe there as anywhere else; either because she is confident in her abilities, or is just logically accessing that fleeing was pointless.

Anime/Manga Differences
Although in the anime she doesn't say anything, in the manga she talks to Donquixote Doflamingo, ordering him to be a good boy and calm down.

Trivia

 * Eiichiro Oda has stated that he tends to name female characters after birds. The tradition continues with Tsuru, whose name means "Crane."