Aoi Ichikawa is the central protagonist of the fictional anime series Nijiyome Academy Z-Cune Aoi, which exists within the universe of Unofficial Sentai Akibaranger. She is a student at Nijiyome Academy, where she attends classes alongside her best friend, Satomi Funabashi. Their lives are dramatically altered when they become entangled in a conflict surrounding extraterrestrial materials known as Seeds. These Seeds fell to Earth and bonded with terrestrial life, granting immense power to their hosts but typically transforming them into violent monsters.

Satomi's late father, Professor Funabashi, had dedicated his research to finding peaceful applications for the Seeds amidst global chaos. In a decisive act to shield Satomi from Seed Satan, a villainous organization seeking world domination through the exploitation of Seeds, Aoi voluntarily merges with a Seed. This fusion grants her extraordinary superheroic abilities, transforming her into a warrior dedicated to combating Seed Satan's forces.

Aoi's primary motivation is her unwavering loyalty to Satomi. Her actions are driven by a deep-seated need to protect her childhood friend, positioning her as both Satomi's guardian and a frontline combatant against threats to Earth. She is characterized as a girl who pretends not to care about protecting the peace, yet she becomes enraged when a monster threatens others. While she can be aggressive and possesses a short temper, she is also amiable and conceals a more brutal side that emerges from the Seed's side effects. Aoi primarily concerns herself with Satomi's safety and her own, often abandoning a calm demeanor when her friend is in danger. Her school life at Nijiyome Academy serves as the backdrop for these planetary-scale stakes.

Within the story of her own fictional series, Aoi receives support from several allies, including Bemuko, Mamo, and a mysterious masked girl named Seed Jeanne, who serves as her rival. The student council morals committee also provides assistance, with their room becoming a base of operations against Seed Satan. Aoi's role in the live-action Akibaranger series is equally significant, though she does not appear as a physical character. Her character design directly influences the technology used by the Akibarangers, most notably inspiring the design of the MMZ-01 Moe Moe Z-Cune transformation device. Her likeness also adorns the Akibarangers' vehicle, the Machine Itashar. Within the narrative of Akibaranger, her fictional anime has a massive fanbase, with main characters like Nobuo Akagi being devoted fans, and its popularity is said to rival that of mainstream Super Sentai.

While Aoi's primary ability stems from her fusion with a Seed, the process is not without risk. The Seeds' properties allow for exceptions under specific conditions, enabling Aoi to harness their power without undergoing a full monstrous transformation. However, if she fights excessively, she risks losing control due to the Seed's brutal side effects. With the help of Professor Funabashi's research and Satomi's assistance, she learned to control her power, transforming parts of her body into armor. In her armed form, her physical strength changes dramatically, but her mind remains her own. Her story and design continued to evolve through multiple films and media releases within her fictional universe.