Traditionally, a fox face is chosen for a Kitsune mask because the cunning mythological animal is believed to be a shapeshifter and has been used in Japanese theatres since the 14th century. The fox is a contradicting animal, capable of both sincere and cunning deeds, but that character trait does not suit Tanjiro Kamado. What is a strong contrast is the fact that the boy wears a Hakuko Mask depicting a white fox denoting a good omen, and yet he wields an auspicious pitch-black Nichirin Sword, suspected to be an unfortunate harbinger. True, Tanjiro wears the kitsune mask that all Urokodaki's pupils do, but a Ryuko Mask (aka dragon fox) may have been better suited to his fire breathing techniques. However, considering the deeper symbolism of the Kitsune, it may just be the perfect fit.