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)