Both are:
Hogwarts Professors
Heads of House
Extremely powerful
MAGICAL
Care for Harry very much (but for completely different reasons...)
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In what would have been Harry Potter's seventh year the headmaster was Severus Snape. It is unknown who became headmaster after that. Possibly Minerva McGongall for a few years before she retired.
I don't recall there being one. It goes dumbledore then McGonagall then after them it is the heads of house. (Slytherin) Snape, (Ravenclaw) Flitwick, (Hufflepuff) Sproat, (Gryfindor) McGonagall.
at the end of the book meaniing after the battle of Hogwarts, the headmistress would be Minerva McGonagall __________________________________________________________________ Okay but then who is the deputy??
Well, the spell casting between McGonagall and Snape actually occurs in Part 2, and as far as I know, the duel between the two of them is much more extensive. But there is speculation that the spell used against Snape is the same used against Nagini by Harry in the courtyard, Confringo.
Professor Remus Lupin. And Severus Snape, Albus Dumbledore, Minerva McGonagall.