She is a complete skater who is perfect in almost every aspect, including skating skills, acting, and expression, not to mention her ability to land Triple Axels as if they were nothing. Her technical skills are often described as being on another level; while some top-tier skaters of her age manage to land the same or even more difficult techniques through grueling training, they still cannot quite catch up to her. Her birthday is January 31st. She does not wear glasses.

However, his self-evaluation as a skater is extremely low, and he becomes visibly dejected whenever the topic arises. While everyone who was around him during his skating days acknowledges his effort and skill, Tsukasa is uniquely harsh on himself and lacks self-confidence. He is very expressive, with his emotions showing clearly on his face, and the tears of joy he sheds whenever he sees his students grow are intense enough to fluster those around him. He is Inori's coach. He has yellow hair and yellow eyes. His birthday is September 4th. He does not wear glasses.

Since Hikaru began figure skating, she has lived as part of the Sonidori household, so they have a long-standing friendship and are practically like siblings. He is aware of the secret mentor-student relationship between Hikaru and Jun Yodaka. He is overprotective of Hikaru and tends to be quite sharp toward anyone who approaches her, which Hikaru finds annoying. Though he consistently maintains a sarcastic tone and a cynical attitude, he is actually a kind-hearted boy. Since there are so few boys doing figure skating in Nagoya, he is relatively nice to male peers. Having inherited the talent of his Olympic silver medalist father and received gifted education from a young age, his skills are quite high, and he is considered a talent capable of excelling on the world stage. As his mother is Brazilian-American, he is trilingual in Japanese, English, and Portuguese. He always calls Inori by nicknames like 'Fried Shrimp' or 'Shrimp.' He didn't even remember her name or face after meeting her three times, but they have now become quite close, eventually forming a friendship where they bicker but get along. He shows typical tsundere behavior, looking after her in various ways while drawing a line and saying he isn't doing it because he likes her. He has blonde hair and green eyes. 152cm. His birthday is November 20th. He wears glasses.

A legendary figure in the world of men's single figure skating and a Winter Olympic silver medalist. Because he was a perennial runner-up to the unprecedented genius Jun Yodaka in the same generation, he is sometimes undervalued, but his skills were certainly great enough to mark a page in world figure skating history. After an honorable retirement, he became a figure skating coach at Meiko Wind FSC, the club he belonged to during his active years. He gives his all to nurturing juniors, actively adopting the latest training techniques from advanced figure skating nations. Due to his passionate management of the club, his hair has already turned white despite being only in his mid-30s. He has a face that looks older than his age and often wears a blunt expression, giving him an intimidating impression similar to Jun Yodaka, but he has a gentle and polite personality, using formal speech even with young students. He is Riou's father. His birthday is May 4th. He does not wear glasses.