Akie, also known as Aki in Western releases, is the aunt of twins Kei and Yumi. Her scientific background involves collaborating with the Professor and Dr. Tomoki on the Monkey Helmet Research Team. During their experiments, a laboratory accident permanently fused the prototype Peak Point Helmet onto Tomoki's head, an event preceding the main series. When Specter's mind-controlling broadcasts ensnare the Professor, Spike, and Jimmy, Akie steps into the role of mission control and gadget developer. She crafts the Morph Gear system, enabling Kei and Yumi to transform into specialized combat forms like Cyber Ace, Dragon Kung Fu Fighter, and Fantasy Knight to oppose Specter's forces. Her expertise directly empowers the protagonists throughout their mission. Akie maintains a consistently cheerful and supportive demeanor, encouraging her nieces, though she displays moments of absent-mindedness, such as nearly falling under Specter's hypnosis. She wears a white sweater with yellow sleeves, blue pants, and brown gloves.

In *Ape Escape: SaruSaru Big Mission*, Specter's forces capture Akie alongside others. During captivity, Blue Monkey develops an unusual fondness for her, leading to notably kinder treatment compared to other prisoners until her rescue. Akie appears in spin-off media, including a secret card cameo in *Ape Academy 2*'s Pink Pop Paradise mode, associated with the Monkey Drill 2 minigame. Her anime portrayal in *Saru Get You ~On Air~* and its sequel series maintains her role as the scientific supporter within the core team fighting Specter, consistent with her game depiction. Akie possesses a noted fondness for pudding, with dialogue indicating she becomes protective of her desserts if others try to take them.