Cha-jiji is the doting grandfather of Zukin-chan, sharing her home and vigilantly guarding her well-being. Once renowned as a master swordsman, he carved his legacy through victories in numerous youth tournaments. He cherishes his pet cat Matcha and is rarely seen without his signature red beret during leisurely tea-filled afternoons.

His playful charm surfaces in a habit of lighthearted flirting with younger village women, frequently drawing laughter or exasperated sighs from onlookers. Conversations with him carry a whimsical unpredictability, punctuated by endearing verbal slips—such as fumbling the protagonist’s name—that underscore his cheeky, aging spirit.