Eugene Pool

Eugene Pool is Sabrina's biology, and favorite, teacher during her sophomore year of high school. He also teaches Sabrina martial arts, in one episode. He sometimes does other odd jobs for, and around, the school, to make extra money. He disappears after Season 1, after Sabrina passes his class. He is replaced in the main case with Willard Kraft. His name is a pun on the scientific term, "gene pool".