i'm not sure i think possibly A & HP. Because all though harry is not as good as Gandalf. He has quite a few tricks, he has a broom as well, which he can fly on really fast and use spells whilst on it. Also from what i know Harry has Imperius curse, cruciatus curse and killing curse, and Gandalf only seems to have olden time spells no real pain damaging ones. Aragon I think is a better fighter and maybe faster than Hood, also i can see Harry using killing curse on Hood then the two fighting Gandalf together.
"twisted... probably Hood and Gandalf... Gandalf's more powerful, magic wise, than Harry Potter, and Hood can take Aragorn down with his archery skills before Aragorn even got close enough to use his sword M"