TV-Series
Description
Ojii-chan is the elderly maternal grandfather of Shizuru and Mizuki Hibara in the anime Mokke, and the head of the Hibara household in the rural countryside where the two sisters live with their grandparents. He is an older man with gray hair cut to about ear length and gray eyes. The girls came to live under his roof because their parents were unable to cope with their unusual supernatural constitutions, and Ojii-chan, as the family member most experienced with such matters, became their primary guardian and guide.

In daily life he works as a local historian, and alongside that occupation he practices as a houshiya, a traditional prayer practitioner and exorcist, taking on spiritual work as a side profession. He is an expert in supernatural affairs with a deep knowledge of spirits and yokai passed down through folklore and old literature, and he has excellent exorcism abilities. He is also a capable psychic in his own right, able to perceive and engage with the unseen world that troubles his granddaughters.

As a person, Ojii-chan is calm, patient, and dependable. He is the steady presence in the Hibara household and the person the sisters turn to whenever a strange event occurs. Rather than simply shielding them from every danger, he offers assistance and advice that allow Shizuru and Mizuki to face their experiences and gradually understand both the supernatural and themselves. His motivation is protective: he wants to keep his granddaughters safe and to help them grow into people who can live in harmony with the world of spirits instead of being frightened or harmed by it.

His role in the story is that of mentor and pillar of support. While the series centers on the sisters and their encounters, Ojii-chan is the one who provides the knowledge, rites, and reassurance that make those encounters meaningful learning experiences. His key relationships are with his two granddaughters, whom he watches over and teaches; with his wife, Obaa-chan, who gently cares for the girls in a more maternal way; and with his daughter Chitose, the sisters' mother, who does not see or believe in spirits and whose skeptical worldview stands in contrast to his own expertise and faith in the unseen.

The character has little dramatic development of his own, but his importance is measured in the development of the girls. Guided by his lessons, support, and example, Shizuru and Mizuki slowly mature and come to accept their unusual gifts. Ojii-chan remains throughout the story a constant, grounding figure: the experienced elder whose spiritual knowledge, protective care, and calm guidance help the next generation find their own way in a world where the visible and the invisible exist side by side.