Ikuhara, Harumi

Harumi is Takeya's stepmother and one of the few individuals capable of keeping the unruly Natsuki in check. She taught Natsuki all the techniques she uses to beat up her older brother, or so it seems. It is also implied that Takeya and Harumi might have fallen in love, but before Takeya could express these feelings, Harumi shoved a cherry tomato into his mouth and said, "it doesn't matter now I am your mother." (Another clue emerged when Takeya panicked and turned to Neneko as Ren prepared to leave Earth; she stated that Harumi had dumped him.) Harumi is a genuinely humorous character with her own "personal attacks," such as the "Harumi-driver."