Uta Mizunami is a central character in the anime film "Bubble." She is a mysterious and enigmatic girl with a unique connection to the strange bubbles that have enveloped the world. Uta possesses an ethereal presence and a cheerful, curious personality that draws others to her. Throughout the film, she forms a deep bond with Hibiki, the protagonist, as they navigate the challenges posed by the bubbles and the transformed cityscape. Her role in the series is pivotal, as she uncovers the truth about the bubbles and the impact they have on the world, ultimately playing a crucial part in the resolution of the crisis.