Madoka Midou, recruited alongside three other high school girls from 1999 AD, pilots spacecraft for the TERRA faction in competitive space battles. Primarily serving as comic relief, she possesses a notably large, reflective forehead frequently targeted by teasing, especially from Yohko Yamamoto. Madoka exhibits a poised yet somewhat spoiled and happy-go-lucky personality, occasionally displaying otaku tendencies. She maintains a persistent rivalry with Yohko, striving relentlessly to surpass her in academics, sports, gaming, and piloting despite consistently falling short. This competitive drive pushes her to overcome personal challenges like vertigo to qualify as a starship pilot.

Drafted into TERRA after stumbling upon its secret operations, Madoka pilots the Super Sprint TA-25. She wields its Vapor Shield offensively as a battering ram, reflecting her impatient nature. As the least skilled among the four pilots, she often experiences frustration and dramatic outbursts after defeats. Her enthusiasm manifests in creating a custom battlesuit and selecting attention-grabbing costumes, like a zombie outfit for a space-based party.

Madoka develops a romantic interest in Yamamoto Yohsuke, a clone of Yohko initially presented as male. This infatuation leads to deep upset when she later discovers Yohsuke's original biological sex was female, a revelation occurring before Yohsuke's physical transformation into a male. Madoka frequently clashes with Yohko over leadership and tactics, retaliating against mockery with the nickname "Nekomusume" (Cat Girl). Despite the friction, she acknowledges Yohko's piloting abilities. Her interactions and rivalries significantly contribute to team dynamics and episodic conflicts throughout the series.