Ms. Avery (Ovary) was one of the most loved teachers at Degrassi. everyone liked her, especially Kaitlin who even helped her get back into teaching after she was demoted to substitute. There was speculation as to her sexual preference in an episode, but later resolved.
Mr. Colby was the teacher I hated the most. He was a substitute who was hitting on both Lucy, Suzy and her younger sister. Luckily, Wheels forgot a book for one of his exams and broke it up just in time.
Doris was the Secretary who mainly dealt with Joey and any other delinquents at the school. One memorable episode was about sexism and Joey and LD got in trouble for the pictures they had in their lockers and she had to inspect the pictures.
Mr. Garcia was the Math teacher, as well as the Sex Ed teacher in the episode where AIDS myths were assessed. This was when Snake "infected" the entire class with AIDS. Snake later found out that his brother was gay in this episode.
Mr. Raditch was the English teacher in junior high and later the principal in high school. I think he had a vendetta against Joey. Always picking on him and taking off Mr. Jeramia's hat the second he entered the classroom.
Mr. Walfish was the Media and Writer's Craft teacher. He gave approval to Lucy to do her moive "It Creeps" starring Joey, Wheels, Snake, Simon and Kaitlin. It was a feminist horror film, but they thought it was comical.
Mr. Webster was the Science teacher. Alex found out that he used the same tests his brother had the year before. Making Tessa promise not to tell, he gave her a copy. As you can guess, the secret didn't last long and everyone had a copy. Mr. Webster found out and made them take an even harder test.