Akino Onko serves as a main protagonist within the WIXOSS Diva(A)Live narrative. She is a member of the idol diva unit "No Limit," performing alongside Hirana Asu and Rei Sakigake. Her distinctive appearance features long golden blond hair tied in a ponytail secured by a green hair-tie and striking yellow eyes. She wears an orange choker centered with a green clover, detached mustard-yellow sleeves, white gloves accented by green stripes at the wrists, and a primarily orange-and-white outfit paired with a mustard-yellow skirt decorated with green pads. Her attire is completed by orange leggings featuring black stripes and white shoes.

Initially reluctant to engage in Diva Battles, Akino joined No Limit only after persuasion, despite her deep knowledge of WIXOSS. Early self-doubt about embodying a "cute" diva led her to consider resigning, but she ultimately committed to the team. Her journey focuses on overcoming these insecurities and embracing teamwork. After No Limit suffered a crushing defeat by the top diva unit Deus Ex Machina, Akino actively supported Hirana's emotional recovery together with Rei. Demonstrating dedication to the team's goals regardless of potential consequences, she participated in a strategic hack of WIXOSS Land to reissue a challenge to Deus Ex Machina.

During the rematch against Deus Ex Machina, Akino contributed to No Limit's coordinated strategy, utilizing cards lent by rival diva units and the legendary Mugen Shoujo member Azami Yuki. Though technically ending in defeat, this battle solidified her resolve and showcased her evolution from an uncertain member into a resilient participant who helped galvanize fan support for the team. Her increased confidence is further indicated by occasionally taking the role of the team's center during performances.