personify the nuerotransmitter seratonin for context seratonin is Inhibitory Neurotransmitter = âWaterâ Type, because of that the colors of the image should be blue. for more info seratonin regulates mood, sleep, and appetite. Is also an intestinal and blood hormone that regulates digestion, blood clotting as well as influencing bone metabolism, liver regeneration, and cell division See more