Koala
Koala is a member of the Revolutionary Army who serves as a fishman karate substitute teacher. She was freed from slavery in Mariejoa by Fisher Tiger three years before sailing with the Sun Pirates and was returned to her home island on Foolshout Island. Koala is known for her constant bright smile even under duress and her later role communicating with Sabo during operations against threats like those in Dressrosa.
Throughout her time with the Sun Pirates she maintained a forced cheerful mood while scrubbing decks and apologizing repeatedly to avoid death. In her Revolutionary Army work she obtains lists of targets, reports on figures like Burgess, and urges regrouping with Hack while confirming valuable intel from sources such as Robin.
Appearance
Koala appears as a young human girl with messy short hair and overalls when first seen on the Sun Pirates ship. She later wears a new dress provided by the crew along with a short bob haircut that replaces her earlier style.12
As an adult Koala has blonde hair and wears a dark hat with round goggles along with a white karate gi labeled RYUGU and a black belt. She is shown sitting on a rooftop edge with a smiling expression while pointing upward with a gloved hand.34
Personality
Koala maintains a constant bright smile despite confrontation and continues scrubbing the ship deck vigorously even after being struck. She expresses thanks in a cheerful and grateful mood while introducing herself and promises to work hard without resting or crying.56
Koala hesitates about new clothes and shows discomfort with sweat drops while fidgeting with her collar yet forces a smile in flashback close-ups. She replies to questions about humans with a soft innocent mood and suggests learning more about each other with hopeful mood.78
Abilities and powers
History
Sun Pirates period
Koala is the young human girl freed from Mariejoa whose home island lies far from the current location. The Sun Pirates ship carries both crew and Koala at sea as narration identifies her as one freed three years prior.115
A few weeks later on Foolshout Island Fisher Tiger stands on the shore and tells Koala this is her homeland. Koala tearfully waves goodbye and tells the crew that lots of fishmen are really nice people while the crew cheers as she departs escorted toward her village.12
Revolutionary Army period
Koala arrives in time to witness events and appears on the battlefield during the attack while present with Cavendish and Bartolomeo. She is inside the palace area and whispers Lucy while observing the scene and asking Sabo for location.1314
Dressrosa events
Early escape
Koala flees Mary Geoise amid explosions and gunfire during the attack carried out by Fisher Tiger. A voice urges her to hurry as she escapes with other slaves through smoke and debris. She whispers about someone fighting to free them from hell while the incident leads to the formation of the Sun Pirates.1819
Relationships
Arlong expresses strong dislike toward Koala's expression and yells at her to stop smirking as it angers him with furious intent. A fish-man defends Koala as only a child while the crew notes her constant smiling feels creepy.115
Koala communicates via Den Den Mushi with Sabo in ruined Dressrosa area and urgently checks if he can hear her while questioning if he plans to drag the Revolutionary Army into war. She reminds Sabo he must maintain position and not brawl with an admiral.2021
Sabo
Koala communicates with Sabo during the Dressrosa crisis and expresses concern that Luffy will be in harm's way if left alone. She snaps in frustration when Sabo notes there is not much she can deal with by herself. Later she whispers in disbelief upon hearing news about Sabo and stares at the distant castle.1722
Koala answers a call from Sabo saying hello this is Koala and expresses relief that everyone is okay and Sabo is safe. She confronts Sabo about going radio silent and retorts that all her calls would have been monitored after he explains using the usual three beat code to signal.2324
Dragon
Dragon discusses Dressrosa events and weapons intel with Koala who confirms the intel is valuable and suggests using the mineral information to approach the weapons mastermind. Dragon orders Koala to summon all Revolutionary Army leaders worldwide while she responds with a positive assessment of Robin.2526