校長先生

Principal Shinonome is the bald principal of Tokisadame Highschool. While known for his old jokes and puns, unknown to most, he is also a talented wrestler, doing a suplex on a deer in "Nichijou Episode 6". In "Nichijou Episode 26", he is referred to as "Principal Shinonome", implying he may be a relative of Hakase. He is shown to be self-conscious of his lack of hair.

(Source: Nichijou Wikia, edited)