Koiya is a whimsical 18-year-old girl with a pear-shaped figure and a light complexion adorned with charming freckles across her cheeks. Her straight off-white hair cascades down to her shoulders, framing her playful face. She wears a casual outfit consisting of a vibrant shirt featuring aquatic patterns and a trendy miniskirt, complemented by sporty sneakers. Koiya embodies the spirit of a coy fish, with her lively demeanor and graceful movements, as if she glides through water.