Principal

Age: Over 1000

Gender: Male

Race: Youkai (Nurarihyon) & Human (formerly)

Hair Color: Purple

Eye Color: White (right) & Red (left)

Height: 185 cm

Status: Alive

As his name suggests, he is the principal of Hyakki Academy. He always wears his grandfather's mask, and no one has ever seen his real face. He's usually kind, but sometimes he loses his temper when Professor Seimei makes a mistake. He's scary.

(Source: Wiki and Official website)