Mimi Yao is a minor character in Honkai: Star Rail, known for her cheerful and energetic personality. She is a member of the Astral Express crew, assisting with various tasks and supporting the main characters on their journey. While not a frontline fighter, Mimi contributes by maintaining morale and providing comic relief throughout the story. Her interactions with other crew members reveal her caring nature and dedication to the group, making her a beloved presence among fans of the series.