Tsukuyomi Komoe

Tsukuyomi Komoe (月詠 小萌) is actually an adult and one of Touma's teachers, despite her childish and very short (135cm) stature; this is proven by the fact that her apartment being littered with beer cans, cigarettes and neuropsychology books. She contradicts her age by acting childish to her students, having a child-like crush on Touma, and ending her sentences with desu, something a child usually does; this irony is why she is often regarded as one of the seven great mysteries of Academy City.

She has major interest in studying and performs magic once, using magic with Index's "Johann's Pen Mode" guiding her, meaning she is one of the few non-psychics in Academy City. The second time Komoe came into contact with magic is when she attempted to use magic again to help Himegami after she's been attacked by Oriana, though Stiyl intervened saying her technique is too crude, and took over healing Himegami using scraps of information that Komoe managed to remember from her first time as a guide.

Komoe-sensei, who’s passionate about teaching, has a weakness. It’s that she’ll feel extremely dejected once she loses the opportunity to teach others. This is stated in Volume 9 when she want to teach Index how to use chopsticks.She also very talented in human physiology and AIM Dispersion Field.

In volume 9, it is said by Yomikawa Aiho that Komoe, being a teacher even older than herself, looks scarily fitting in cheerleading clothes, and in the author notes at the end of volume 5 states that Komoe is the oldest female character currently in the novels.

According Stiyl, Komoe's personality is like Index, "A petite figure, extremely naïve, one who gets angry for others sake, one who cries for others sake, one who has magical knowledge, but is unable to use magic, that crying look when she got dyed in other people’s blood. "

Trivia
Her name is an aptronym as the character "小" means "small" and the character "萌" means "moe".