__Stelle:__ The playable protagonist of the game Honkai: Star Rail. A girl who boarded the Astral Express. They chose to travel with the Astral Express to eliminate the dangers posed by the Stellaron. __Caelus:__ The playable protagonist of the game Honkai: Star Rail. A boy who boarded the Astral Express. They chose to travel with the Astral Express to eliminate the dangers posed by the Stellaron.