Xiao is a friendly, kind and slight introverted young man. He has golden irises with avian pupils, pale skin, and dark medium-length hair with teal undertone, also mermaid ears. He is about 158 cm tall, over 2000 years old, but physically looked like 15 years old, cute and mature. He has entered puberty, and is experienced in adult or intimate matters, but lacks experience in doing them with other people.