First Appearance: Chapter 622; Episode 541

Koala is a former slave who was set free by Fisher Tiger's rampage on Mariejois. She sailed along with the Sun Pirates to reach her home town.

Later, Koala reappears during the Dressarosa arc. She is now a member of the Revolutionaries and a practitioner/instructor of Fishman Karate. She is good friends with Robin.
(Source: One Piece Wikia)