Ayaka Nikaidō serves as the president of the Second Journalism Club at her school. She shares a familial connection with Yūki Akamatsu, being a relative of his, which plays a significant role in how she draws him into the club's activities. Ayaka is responsible for convincing Yūki to become the director of the life counseling section, a decision made as a form of gratitude for his assistance in helping her keep the journalism club from being closed down. Her position as club president places her in a leadership role, and she immediately assigns Yūki to manage the advice column upon his joining. She is also perceptive regarding the personal dynamics within the group, appearing to be aware of the romantic feelings that Rino Endō harbors for Yūki.

In terms of appearance, Ayaka is a girl with long, waist-length hair. Her hair is primarily silver or mostly white, and it features a gradient that transitions to a dark purple color towards the ends. She has golden eyes and her typical school attire includes a brown and tan sailor-style uniform, which she pairs with thigh-length black stockings. This outfit choice is a notable aspect of her visual design. No reliable information is available regarding her personality, motivations beyond her role in the club, character development throughout the series, or any notable special abilities.