Seira Mizuki is a cheerful and energetic idol from THE IDOLM@STER Cinderella Girls. She is known for her sporty personality and love of animals, particularly dogs. Seira is always enthusiastic and strives to inspire others with her perseverance. In the series, she plays the role of a Passion-type idol, bringing a vibrant and uplifting presence to her group. Her friendly nature and dedication make her a supportive friend and a memorable performer in the idol community.