Asahina Tenma

Spoiler

Age: Unknown (It's around 400 so he won't tell anybody).

Hobbies: Cooking, Home-gardening, Studying
Special Skill(s): Holding multiple classes at the same time (His best record is holding 6 classes at once when the teachers for those subjects fell sick— however, he's aiming for 8 classes as his best record)
Favorite Food: Chocolate
Least Favorite Food: Tomato, Garlic

The health doctor at the protagonist's school, however he also has teaching certificates for all subjects. At lunchtime he's the cafeteria chef, after school he's the janitor he's a Super All Rounder Teacher.
Because of this one of the schools seven mysteries is that he is a group of sextuplets.