- Miss Ayumi (亜弓先生 Ayumi-sensei)
- Miss Ayumi is a teacher at Graviton High School who has A-ko, B-ko, and C-ko in her class at the same time. This means that she has the task of trying to get C-ko to learn while preventing A-ko and B-ko from murdering each other.
- Miss Ayumi is modeled after the lead character of the eponymous TV series Creamy Mami, one of several magical girl TV shows that came out during the 80s.
Voiced by: Asami Mukaidono (Japanese), Lynda Boyd (English) and Lisa Ross (first movie only)