His design seems odd BUT WAIT.
By the rules of character selection law, he should have 2nd and 3rd outfits. Perhaps his old model outfits..or an outfit where he has hair on his head.
In DoA Dimensions he got as C3 a pre-transformation caused from the DOATEC experiments (so Raidou in his natural form). However this time is not so sure because he had no way to return to the characteristics pre-accident.
By the way I like his current design and actually doesn't amaze me after all: for the majority, Raidou's outfits are always been for the most monochrome (grey/black/brown)
However along the years there were some exceptions (but keep in mind that the three outfits over are his iconic ones) and I'm sure that in DoA5 will happen the same and we will get more colorful outfits even for his current version (overall, it's pretty possible that new outfits will show a different color for the cyborg implants).
By the way seems to me obvious that with his C1 TN tried to give him a Terminator vibe, an overall unique dark colour where make exception only the red tied to his cybernetic parts: now his terminator red eyes - just a taunt in DoA1 - got really that meaning.