Dan Heng is a cold and reserved train guard and archivist of the Astral Express. Wielding a spear named Cloud-Piercer, he joined the Express crew to escape his secluded past. He never talks much about his past. He says what he likes and dislikes emphatically. Dan Heng has blue eyes, fair skin, and dark brown hair. He wears a black turtleneck, a white and turquoise-coloured coat, grey pants, black high-top shoes, and an oriental-styled jade tassel earring with lace connected to his other ear.