Pity about Michael; I know where you can find some excellent free plate armour for him, in addition to many bits and pieces.

Let's see ....

CG-Fantasy : Lourdes has a couple of Road Warrior-esque outfits and a suit of futuristic armour.

Ether Forge : helms, bracers, breastplate, and a mail body texture

Blade Studio : helmets, shields, an assortment of weapons

Neo Japan : samurai armour

GreyLight : a few helmets, breastplate and greaves, some shields and weapons

Warhammer 40k : futuristic armour suits based on the tabletop wargame