Miko is a recurring supporting character in the anime Dan Da Dan. She is a young high school girl of average height with brown hair that she usually wears in a small bun, along with earrings and makeup consistent with her school uniform. Miko is one of Momo Ayase's closest friends and classmates, forming a trio alongside another friend named Kei.

Her personality is candid and straightforward; she freely speaks her mind and often expresses impatience, teasing Momo about her tastes or bluntly commenting on situations. Despite this blunt exterior, Miko is genuinely caring, loyal, and quick to come to the defense of her friends when needed. She serves as a grounding presence in the group, providing comic timing and energetic commentary during everyday school life. She does not possess any supernatural abilities and remains uninvolved in the direct paranormal conflicts that define the main plot, instead acting as a supportive audience and confidante for Momo.

Miko's primary role in the story is that of a reliable friend and classmate who interacts mainly in school settings. She helps illustrate Momo's ordinary social life before and after her supernatural adventures. Her relationship with Momo is built on mutual trust and honest banter; she is among the first to notice changes in Momo's behavior and supports her without judgment. She also interacts with other classmates such as Ken Takakura, whom she and her friends refer to by the nickname Okarun, though her involvement remains mostly observational. Over the course of the series, Miko shows little personal development in terms of power or arc, but her unwavering loyalty and grounded perspective make her an important emotional anchor for the main cast.