I wouldn't say Revengeance applies. I mean, yeah, a lot of the (white) boss characters wear black (the Brazilian one wears white/beige) and the white guy that inspired Trump turns black when you hit him but it's because carbon fiber is black (he turns metalicy black) and it's all nano-machines and usual metal gear techno-magic bullshitery. Like, Raiden, the good guy (white), goes from a a white robot body into a black one after the tutorial and he's the hero character.
Then again I don't see the "dark clothing" as being the same as "black villain". Like, I'm fine if the bad guy is the only one wearing black or dark colours but if the only dark skinned character was the bad guy then it gets weird.