6. Prometheum Armour
In the Heroes Reborn storyline, numerous Marvel heroes (and a few villains, such as Doom) were deposited in a kind of pocket universe; it gave the writers a chance to play around with their backstories, their designs, and their personalities. It also brought up the opportunity for a redesign of Iron Man’s armour, and the storyline spawned something truly memorable in this regard.
The Prometheum armour was a double-edged sword. Its initial test had caused the death of one of Stark’s co-collaborators, and he would never have donned it himself had his life not depended on it following a helicopter crash. Nevertheless, it did its job well; it is functionally very similar to his classic tech, but visually striking, the exhaust ports in the place of wings giving him a metallic, insectoid appearance not dissimilar to Goldbug or DC’s Firefly.