Xiao is shown to be quite polite, reserved, logical and decisive, but concise and straightforward. He is rarely in a good mood and prefers solitude. He has a high sense of morality and justice. He is a professional calligrapher and also knows how to play the flute. His favorite food is almond tofu. Xiao has medium-length black hair with a turquoise hue, pale skin and amber eyes. He has green tattoos on his right arm.