Nao Yūki is one of the main heroines in Smile Precure!, and her magical girl form is Cure Sunny. She is energetic, athletic, and straightforward, often acting as the team’s physical powerhouse and a source of encouragement. In the series, she fights alongside the other Pretty Cure members to protect happiness and stop the forces of despair. Her cheerful confidence and strong sense of justice make her an important support pillar within the group.