Thanks.
I wanted to be as realistic as I could and avoid being too matchy-matchy.
My thinking was that the Ashigaru and Izamu were the undead army with purple regimental colors and Yan was the detatched, manipulating necromancer.
The gray fabric on Yan and the Porter is treated with the same pale purple highlighting I did on the gray on the others. Other than the brown, all the other colors on Yan are on the skeletons; his hair is the same paint as the bones as is the Porter's fur dry brushing. I plan to do Chiaki quite colorful in green and pink, I put the green bracelet on Yan to pick up on that.
I will think about maybe painting the black bracelet purple but its my intention to have the "troops" purple and the the "command" more distinct. Red will be an element on all the ancestors.