校長先生

He is the School Youkai of the 1st rank, "The Headmaster". It is said that he slips out of a photo of a principal from ages past in the principal's office and wanders around the campus grounds.

It is also said that he spirits away students that he meets and erases any trace of their existence from reality itself. He shows a calm disposition but he hides a terrifying brutality. Now he's older, but once he was a youkai who could devour entire schools.

It seems he has a terrifying wife as well, so he spends his time at school to avoid going home.