Miki races as Todoroki's partner in the intergalactic Redline competition aboard the unconventional legged bike Semimaru. During the Redline race on Roboworld, their strategy to dig a shortcut backfires, trapping them in heightened danger and causing significant delays that leave them far behind competitors.

As the Yellow Line racing team's mechanic, Miki demonstrates exceptional technical skills in maintaining and optimizing the team's vehicle to competitive standards. The character exhibits a strong, independent personality with direct and unreserved communication, often expressing opinions bluntly. Dedication to the team's success drives Miki, including a willingness to make significant sacrifices for victory.

Passion for racing and mechanical work defines Miki, with notable enthusiasm focused on the race vehicle. Interactions with the vehicle reveal moments of attentiveness that contrast with an otherwise tough demeanor.