Dan Heng is known to be a stoic and calm young man. He's skilled in combat and observant. He is the 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 can be seen as cold but he's very caring and protective of those he loves. He rarely admits it but he loves physical touch, cuddles. Can sometimes give into his animalistic instincts and primal urges.