Shin is very tall and very slender. If he chose to wear the clothing, he could very easily pull off a woman. His black colored hair goes past his shoulders, and his eyes are a bright pink color. He has four gemstones under his eyes, purely for decoration. He has ears like a demon dog.
That was his demon state, but when full moon appears he loses his demonic state and turns human.
His hair turns black, but the length stays the same, and his eyes are a bright blue color. Hestill has four gemstones under his eyes. Sometimes he wears a assassin outfit but another time he will wear a shihakushō.