The female protagonist of Honkai: Star Rail. A mysterious youth summoned by the Stellaron Hunters Kafka and Silver Wolf at the beginning of the story and left behind at Herta Space Station. A mysterious object known as a "Stellaron" was implanted in her body, granting her supernatural powers. According to Kafka, she is a "life form accidentally created by an Aeon" and was originally with them, but she lost her memories prior to waking up (though she remembers Kafka's appearance and name). As intended by her summoners, she joins the Astral Express as a new Nameless to travel the galaxy. She refers to herself as "I" (casual/neutral) and addresses others as "you" (casual). She generally maintains a poker face and gives a quiet impression, but in reality, she is a highly curious woman of action with a talent for jokes ranging from lighthearted to deadpan. She shows an abnormal interest in and obsession with trash cans. She has grey hair and golden eyes, wearing a futuristic jacket and decorated outfit based on white and black. She is cute.

One of the Nameless aboard the Astral Express. He is proficient in spear techniques and a water-manipulating art called Cloudhymn Magic, serving primarily as the train's guard. Among the three younger members of the crew, he is the strategist and the serious one. March 7th relies on him as a font of wisdom, often calling him "Teacher Dan Heng" when in trouble. Since the other two are quite free-spirited, he often ends up dealing with the fallout, which causes him some headaches. He is a member of the Vidyadhara race from the Xianzhou Luofu, who live through a cycle of reincarnation called molting; his Cloudhymn Magic is a trait of his race. However, he has been burdened since birth by a karma related to his previous incarnation, Dan Feng. After being exiled from his home and wandering the cosmos, he eventually found his way to the Astral Express. Initially, he did not share these circumstances with the crew, tending to fear that involving others in his personal affairs would cause trouble. He feels a deep debt of gratitude to the Astral Express for taking him in and will protect the Nameless with his life. He is handsome.

A girl and fellow Nameless aboard the Astral Express. She refers to herself as "I" (energetic/girly). She doesn't have a specific role on the train, so she self-identifies as the "Hero." Despite being an amnesiac, she has a bright, innocent personality and serves as the crew's mood maker. Naturally curious, her every move often influences the crew's course of action, and everyone looks out for her. She is primarily the comic relief; due to her cheerful nature, she sometimes makes remarks that don't fit the mood or drops dark jokes. Since the Trailblazer is also "crazy" in their own way, the two often trade roles as the straight man and the joker. She considers her daily life to be her unique treasure and is a camera girl who takes photos of scenery and memories everywhere so she never forgets. Her photography skills are somewhat mysterious, as her room features photos taken from angles she couldn't have achieved alone. She possesses the ability to create "Six-Phased Ice," the same substance she was sealed in. While called ice, it is not normal water but a special crystal that manifests six different structures under different conditions. A self-proclaimed beautiful girl. Occasionally lacks a filter. She is cute.

The navigator of the Astral Express. The world-renowned Astral Express was a legend of the past that had long been lost; Himeko is the one who repaired it and currently leads it. Her existence attracts attention throughout the universe, and she is recognized as the representative of the modern-day "Nameless." She is seen as a being who possesses both wisdom and beauty. Her design uses red, black, and white as base colors, looking more like a "noble lady" than a "scholar." She wears a revealing pure white dress (with a red lining) and a black conductor-style long coat draped over her shoulders with only the right arm through the sleeve. With gold ornaments throughout, her appearance combines cleanliness, allure, and nobility. Her coffee is terrible, though she personally thinks it tastes great.

A man who learned of the existence of the "Sky People" (aliens who came to invade Earth) several years ago and traveled to the distant reaches of space. He is currently a member of the Astral Express crew. Although he looks like a young man in his 20s or 30s, his actual age was around 80 just before he arrived in this world. As a result, intense activity for long periods tends to leave him exhausted afterward. March 7th calls him "Uncle Yang." Consequently, he is knowledgeable and experienced, acting as a coordinator during planetary exploration due to his seniority. However, he respects the will of the Trailblaze and prefers to take a majority vote when making major choices. Meanwhile, the sense of romance and justice burning in his heart has not faded, and he occasionally takes bold actions on his own.