For a long time now I have been toying with the idea of perhaps doing a classic doom Arch-Vile, or a Cyberdemon (my height of 6'6" would seem perfect for such large and ornate creatures), but then again the Revenant, Hell Knight and Baron of Hell are just as suitable options, Doom is a very underused market for cosplayers, the creature designs were brilliant in their day and still do tend to scare the life out of me when i play the game.
However I might not be able to do creatures which are so emaciated due to my size of 270lbs.
The mind is its own place, and in it self
Can make a Heaven of Hell, a Hell of Heaven.
Better to reign in Hell, then serve in Heaven.
Satan - John Milton's Paradise Lost