i probably shouldn't be barging into this debate, but i do believe color schemes in the anime are usually from Oda himself.
for example, Queen was revealed to have blonde hair in manga Volume 93 cover way before his debut in the anime, and the anime has him blonde too, so it's fair to assume that the anime staff consult Oda about character colors, especially for Wano which he wishes to make as colorful as possible:
there however are some unusual exceptions of colors being decided by the anime before Oda, like Kuma originally wearing orange in the manga instead of black in the anime, and Mihawk having red eyes in the manga instead of yellow ones in the anime. not sure about those.