I tried to combine his WW2 costume with that of the Hydra tights. I wanted to redesign the Hydra logo and streamline it better to better implement as a design element for the costume.
My basic idea is that he is sort of a void of power. Make him a more visual representation of the “abstract” concept. The hole in his chest is where he eats planets. Afterwards his body physically becomes whatever main element of that planet was. So if he eats a star, his body becomes fire.
