Principal Larue was the principal at Westbridge High School for the first three seasons of the series. Principal Larue was a surly man who showed little to no passion for his job. Mr Pool would wash Principal Larue's car on Saturdays in order to make more money and attempted to kiss up to him a lot in general.
He only appears in Season One, however he is mentioned several times in later years. Presumably Principal Larue left the school in the time between the third and fourth seasons; allowing Vice Principal Kraft to take over his position during Sabrina's fourth and final year at Westbridge High.