Obaa-chan is the grandmother in the anime Mokke. She lives in a quiet rural village in Japan together with her two granddaughters, to whom she serves as a primary guardian and guide. Her background is shaped by a long life in the countryside, where she has remained closely tied to the land, her garden, and the traditional customs of her community. Despite her advanced age, she stays active and is often seen working outdoors or taking part in local village festivals.

In personality, Obaa-chan is gentle, warm, and deeply devoted to her granddaughters. She carries herself with quiet confidence and is firmly grounded in a worldview that treats the spiritual and the everyday as parts of the same reality. She holds a strong belief in the coexistence of spirits and humans, and this belief shapes how she responds to the strange events that occur around her family. Rather than fearing the unseen, she approaches it with respect, patience, and practical good sense.

Her motivations center on protecting her granddaughters and passing on the knowledge she has accumulated over her lifetime. She has a vast knowledge of Japanese mythology and supernatural creatures, and she frequently shares stories about them with the girls. These stories are not merely entertainment; they serve as lessons that help the girls understand the spirits they encounter and learn how to behave around them. She is committed to teaching that spirits are not simply dangers to be fought but beings with whom humans can learn to coexist peacefully.

Within the story, Obaa-chan acts as a mentor and spiritual guide. Whenever her granddaughters, who possess a special ability to see spirits, come into contact with the supernatural, it is her wisdom that helps them interpret what they have witnessed and decide how to respond. She provides them with knowledge of the spiritual world and instructs them in the proper conduct for handling encounters, guiding them toward understanding rather than fear. She also plays a key part in helping the girls develop their abilities and learn to control them, acting as a steady, reassuring presence in their lives.

Her most important relationships are with her two granddaughters. Through her gentleness, patience, and unwavering love, she gives them both emotional security and practical guidance, and her presence strengthens the bond among the three generations of women in the family. Throughout the series she remains a stable and constant figure; her own development is expressed less through dramatic change and more through her growing influence on the girls as they mature. Notable among her abilities are her deep knowledge of folklore and local legends, her strong connection to the spiritual world, and her gift for storytelling, all of which she uses to teach the next generation how to live alongside the mysterious world around them.