Mio Usagi is a character who first appeared in the film Salvage Mice before making a guest appearance in the first season of Unofficial Sentai Akibaranger. She is introduced as Mitsuki Aoyagi’s martial arts rival. When the Akibaranger team attempts to prolong their show by recruiting new members, they seek out Usagi, only to discover that she has been injured in a bicycle accident and requires three months of recovery. This effectively removes her as a potential addition to the team. Her role in the narrative is therefore that of a brief obstacle or dead end in the main characters’ quest, as well as a direct link to Mitsuki’s personal background as a martial artist. No further information is available about her personality, deeper motivations, character development, or special abilities beyond her implied skill in martial arts.