Jiiya, also known as the Chauffeur, is the dedicated driver and personal attendant for the affluent Ono family, having served them loyally for many years. His primary responsibility is caring for Akira Ono, whom he has watched over since her childhood, ensuring her safety during daily commutes and other travels in the family limousine.

In terms of personality, Jiiya presents the classic image of a calm, composed, and impeccably dressed butler, but he possesses a surprisingly gentle, understanding, and loyal nature beneath this professional exterior. He is capable of quiet discretion and subtle humor, often demonstrating a lenient and benevolent attitude towards Akira's wishes. A notable and defining flaw is his pronounced passion and self-confessed addiction to pachinko, which he sometimes prioritizes over his duties. His driving style, while well-intentioned, is famously dangerous and leads to repeated, comedic traffic collisions involving Haruo Yaguchi.

Jiiya's primary motivation is the well-being and happiness of Akira Ono, whom he supports with quiet persistence. He acts as a silent guardian, often using his position to covertly facilitate her desires, such as hiding portable game consoles in the glove compartment of the limousine to circumvent the strict rules imposed by her tutor. He initially regards Haruo Yaguchi with some distance but eventually recognizes the boy as a precious and important friend and support for Akira, even encouraging their relationship behind the scenes. Though he sometimes attempts to defend Akira's interests against other authority figures, he continues to work alongside other members of the Ono household staff to provide support during difficult situations.

Within the story's framework, Jiiya serves as an emblem of the restrictive and controlled environment Akira lives in, while also acting as one of her few kind and indulgent allies. He undergoes a subtle development from a distant observer to a more active, though still discreet, supporter of Akira's personal growth and her connection to Haruo. His role is largely to facilitate Akira's movements and provide moments of levity, but his quiet devotion and insightful respect for Akira's choices make him a significant, if background, presence in her life. His notable abilities extend beyond his official duties, as he excels in household management and provides crucial emotional and moral support to Akira, all while maintaining his public post as the Ono family's driver.