Depending on the desired outcome, there are a few different colors that could be used on Tanjiro. For a natural look, an earthy brown or green would be suitable. To brighten Tanjiro's features, using a light pink or peach would accentuate his cheeks and create a healthy glow. Finally, to give him an eerie appearance, using black or navy blue around the eyes will make them look sunken in and foreboding.