It is McGonagall.

It is McGonagall.

Thank u guys so much xx

You're right, it's McGonagall.

Slughorn is their Potions teacher until third or fourth year, who I think is then replaced by an unnamed woman.

Neville Longbottom is the Herbology teacher.

The DADA teacher is an unnamed woman.

Yay neville!!!! ;D

Professor McGonnagall.

Yup, and also-

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Correct

Mcgonagall. It was going to be a witch named Marizon, but when JKR was reading the early script she thought it would be better for it to be an elderly Mcgonagall instead.