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.

An enthusiastic girl who was saved from eternal ice by the Astral Express Crew, and has the unique ability of being able to use "Six-Phased Ice." When she awoke, she knew nothing of herself or her past, and decided to name herself after the date of her rebirth, "March 7th." She takes many photos using her camera in hopes of discovering a memento from her past.

Himeko is an adventurous scientist who encountered and repaired a stranded train as a child, she now ventures across the universe with the Astral Express as its navigator.

An animator by trade, Welt is a seasoned member of the Astral Express Crew and the former sovereign of Anti-Entropy who has saved Earth from annihilation time and time again. He inherited the name of the world, "Welt."

Trailblazer has a chaotic, mischievous, and pragmatic personality, often acting like an exasperated but helpful "gremlin" or a "win-win" deal-maker who enjoys trolling but isn't truly malicious, balancing serious moments with silliness, and generally being loyal to the Astral Express crew while remaining somewhat morally ambiguous or chaotic neutral.

Former head of the Oak Family, now a member of the Astral Express.