That aside, I might get something thrown at me for saying this, but I kinda like the character designs, for DD Neon. Seeing as I shared my thoughts on the Neo-Geo DD designs, I figured I’d do it again, here:
The palette-swap style just looks too silly on 3D models. I know it's supposed to be a throwback to the original arcade game, but that was a product of 1987 hardware limitations and it's pretty obvious that Technos wanted to distinguish the Lee brothers by differentiating their designs a bit more than that.
Williams is quite well translated, from his NES DD1 appearance. No complaints, there.
Roper seems to be a tribute to Jim Kelly. He looks a lot like Mr Jones, from RoTD, who was himself likely a tribute to Mr Kelly. The thing is, Kelly didn't play Roper, in Enter the Dragon. He was Williams!
I always thought the black variants of Williams in the arcade version always looked a bit like Jim Kelly, but since there aren't that many of them (especially compared to the black Rowpers), it's not really that noticeable.