Hideji Saijō, affectionately known by the nickname Hide-Jii, serves as the dedicated butler of the Hanawa family. He presents a distinguished appearance with grey hair, prominent bushy eyebrows, and a moustache, often seen wearing rimless spectacles with a black frame. His attire consistently consists of a black coat, formal black pants, a white shirt, a necktie, and black shoes.

Kindness, humility, and profound devotion define Hideji's personality, especially evident in his attentive care for Hanawa-kun. His hospitable and amiable nature garners admiration from the young master, his friends, and others within their circle. His primary focus and great skill lie in meticulously attending to Hanawa-kun's needs, and he maintains a professional yet caring service to the family. He also interacts respectfully with Maruko's family and Hanawa-kun's classmates, consistently demonstrating his supportive character. His preferred foods include gratin dishes and traditional Japanese cuisine. The character's name draws partial inspiration from the real-life 1970s pop idol Hideki Saijō, reflecting the series' use of Shōwa-era cultural references.