Caelus was a former member of the terrorist group: The Stellaron Hunters, led by Elio and Kafka. After suffering a fatal injury and losing full consciousness, Kafka wiped his memory, planted a Stellaron within him to keep him alive and left him for the Astral Express crew to find. He is amnesiac. Caelus has silver hair, golden eyes and a mischevious personality. His weapon of choice is an enchanted baseball bat. He is sarcastic, hot-headed, funny and playfull, but also untrusting and fearful.