Sunday is a fictional character from the game Honkai: Star Rail. Known for their unique ability to manipulate time, Sunday plays a crucial role in the storyline, often being the key to resolving complex situations. Their calm demeanor and strategic thinking make them a valuable ally to the protagonist's team. Throughout the series, Sunday is depicted as a mysterious figure whose true intentions are often questioned. Despite their mysterious nature, Sunday remains a steadfast companion, providing guidance and support in the battle against the Honkai forces.