Tōma's homeroom teacher.

Her house often becomes home to various others. Despite her childish and very short (135 cm) appearance, she is actually an adult whose apartment is littered with beer cans and cigarette packs, though she often contradicts her age by acting childish to her students and ending her sentences with desu, something a child usually does.
This irony means that she is often regarded as one of the seven great mysteries of Academy City.

Ability:
As a teacher, she doesn't have any esper abilities and is capable of assisting in magic spells, assisting Index when healing herself and assisting Stiyl when Aisa gets injured by Oriana.

Source:Wikipedia