6
Choose two to defend you - the other's will hunt you down
(sh.itjust.works)
Professor Flitwick and Professor McGonagall probably. They both showed quite great strength during the battle of Hogwarts.
Also Newt really wouldn't hurt a fly (both figuratively as literally) and Umbridge has shown little real strength.
Bellatrix has too much grandiose and would probably be beaten easely by McGonagall, leaving Sirius as the only real contender.
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