Mr. Freeze of Course. When I saw down to draw this, I wanted to suggest more then draw. I ended up drawing then erasing in Photoshop until I felt it was ready.
Freeze looks big here on purpose. The suit enhances his strength, in addition to keeping him alive, and with all that armor plating to prevent punctures in his life support as well as make him a tank; I would not imagine it would be very light and form fitting.
So imagine a very frail and sickly man inside of a big cold steel shell.