Thalassa is officially blue for water, Hydra is green. Lady Prometheus is wearing a blood red dress to symbolize the vulture pecking out the liver every day for eternity as her punishment for stealing fire from the Gods and giving it to man. But I'm still not sure what to color the other characters with yellowing. Figure I'll take a break, walk the dog, and play violin.
phenorax
Its kinda traditionak for Zeus to be yella for all the lightning he shits down on mortals tho it is a pretty obvious choice.Maybe Hades with a more neon yellow colour because of all the fluorescent mushrooms?