My memories of Michael are of a very large man, but I was small and you all looked large so I don't know how big he really was in comparison, although I think he was pretty big even among the angels. He was definitely more well build than guys like Az and Taz and even Shem.
He had fair hair - fairer than Shem but not as fair as Rapha'el. He wore it quite short, although collar length at least, and it was curly. He wore light coloured armour and a helmet with a lion on kind of a badge at the front. I'm not sure but it might have been on his chest plate too.
He carried a flaming sword and he was arrogant.
I won't go any further because my memories are tainted and, although I am not proud of it, my anger, bitterness and hate will warp whatever else I might have to say, which isn't fair for earnest seekers