My biology teacher in middle and high school. She was very serious and strict (think McGonagall) but once you were a bit older she was super intelligent and sarcastic. She was extremely proud of me for wanting to study biology and was one of the few people to be proud of me for doing it. (I got emotional just to remember her cheering when i graduated).
My english teacher in Middle and HS. He was a really brave man to be gay in a chatholic repressed school (that didnt fire him because back then not a lot of people could teach english). He was a really good guy that encouraged us to watch movies or listen to music in english. Many made fun of him for being so cheerful (and gay) but he was awesome and didnt let it stop him.