Biko Daitokuji

Driven by megalomania and immense wealth, this brilliant inventor uses her mechanical genius to build powerful mecha for her schemes. She maintains a fierce, one-sided rivalry with A-ko, fueled by intense jealousy over A-ko's popularity. However, her true obsession lies with C-ko, a fixation that stems from a childhood pattern of bullying disguised as affection. Though she plays the villainous antagonist, her complex motivations stem more from a desperate, unacknowledged crush than true malice.