Nyanjii hails from a magical realm, serving as both guardian and the one who raised Myamu. This elderly man stands short, marked by gray hair, thick eyebrows, and a mustache. His distinctive hairstyle includes a curly fringe and tufts suggesting cat ears. His name fuses "nyan" (the Japanese sound for a cat's meow) and "jii" (meaning grandpa), echoing his feline associations and grandfatherly role. He presents a strict exterior, particularly when lecturing Myamu for her immature or misbehaving actions, masking underlying kindness. His deep devotion stems from raising her, driving a vigilant watch over her well-being. His primary concern is her struggle to control her potent magical abilities, reflecting his protective nature and sense of responsibility for her safety.