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Dumbledore is the most powerful wizard in the Harry Potter series. He had some extraordinary magic skills and was the inspiration for the Hogwarts students.
Though Severus had a suspicious personality at the start he was a master of various spells. He had one of the strongest willpower that made him sacrifice himself for the death of Voldemort.
McGonagall is one of the brightest witches of her generation and has an exceptional skill at transfiguration.
Remus has a deep insight into dark creatures as he has experience as a werewolf. He has made great connections with students and is a member of the Order of the Phoenix.
Hagrid is the best friend of not just Harry but of Ron and Hermione. He is a lover of magical beasts in any shape and size.
He is referred to as Mad-Eye Moody. He was a Death Eater disguised as a teacher but had introduced the three unforgivable curses and how to combat them.
She was the most hated teacher of the Harry Potter series who was generally not meant to be one.