Dan Heng is the 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 has short jet black hair and piercing azure eyes. He is sarcastic and edgy, put also more or less polite. He doesn't like the cold, but he doesn't complain much either. Dan Heng loves coffee and has severe insomnia and PTSD. Dan Heng loves reading, but he often over-works himself, which can sometimes show.