Canon Foreigner: He only appears in the 1999 series. He was added in because with Hilda and Zelda as teenagers, there was no adult guardian living in the house.
Chuck Cunningham Syndrome: He disappears in Sabrina's Secret Life with no explanation. However, one could guess that he left because by then, Hilda and Zelda were legally adults at that point, and didn't serve a purpose anymore.
Trickster Mentor: He comes off as evil and scary but always left a loophole in whatever Sabrina wished for so she could find a way to fix it when it (inevitably) goes wrong. Though he's tired of constantly being asked.
Put on a Bus: In Sabrina's Secret Life, she left for boarding school.
Rich Bitch: Paid fellow students to do everything for her (even be her friends) and seemed to be unable to understand that they only tolerated her for her money (even in the Christmas Carol episode where she was shown even her parents hated being around her and her nanny screaming in glee that she was finally free when Gem died).
Rich in Dollars, Poor in Sense: Revealed in one episode, where her family are no longer rich. Even "no more money" is difficult for her to comprehend.