I'm going to do a basic stripe pattern, down the center of the helmet and breast plate and a few a pieces offset from each other purple. The hex visor film I currently have is blue, but I was able to exchange it for a purple one. Just waiting for that to come in.
But yeah, purple stripes with a typical black, gunmetal grey. Purple based on my cosplay handle Voidshift.
Not sure about accessories or extra markings yet, but I'm sure it'll come to me.