Kaito Kazanin is a young man with medium-length pink hair and pink eyes, the youngest of two brothers in the family that owns the Kazanin Zaibatsu conglomerate, where his older brothers work. His name reflects a cheerful and pleasant nature, along with celestial and floral meanings. Though his status as the youngest sibling lends him an innocent and occasionally spoiled temperament, he maintains a polite demeanor that helps him build positive relationships across all ages and genders.

He lives with his parents, two older brothers, and a female Japanese Spitz named Marcha in a house featuring a garden comparable to a park. The family also owns a beauty salon. Kaito was scouted for his high skill in futsal and enrolled as a first-year student in Class E at Adalbert Academy High School. He is often accompanied by his childhood friend, Sei Kyogoku.

His hobbies include visiting cafés and snowboarding, and he possesses unique talents such as playing the piano and having absolute pitch. Kaito enjoys lively environments and dogs but dislikes thunderstorms. His favorite foods are sushi and New York Cheesecake, while he avoids broccoli. His star sign is Leo, and his blood type is B.