Krieg from Borderlands.
Trained on Illustrious-XL (v2.0-stable)
The mask still doesn't look as good as I want it to, but it's decent enough.
V2 is more accurate and insanely better overall than V1 (which I shouldn't even have posted lol). It's a bit finicky, but you can make both his outfit from Borderlands 2 and 3 with the right trigger words (and a bit of luck). Use this to improve the mask when upscaling.