Mamu is a beastkin who lives in Taiju Village, one of the settlements within the world of Farming Life in Another World. She serves as the caretaker of the village's nyunyu-daphnes, a type of creature, and also looks after human residents. Mamu came to the village as part of a group of migrants from Howling Village. Initially, she and the other migrants were frightened, believing they would be treated as slaves, but under the care of Ramurias, they were welcomed and treated kindly.

As a beastkin, Mamu possesses animal-like traits, though specific physical details are not emphasized in the available information. Her personality is defined by her initial fear and cautiousness, which gradually gives way to a sense of security and belonging as she becomes accustomed to the peaceful and cooperative environment of Taiju Village. Her primary motivation is to contribute to the community and care for those under her watch, including both the nyunyu-daphnes and the humans she tends to.

In the story, Mamu holds a supporting role, contributing to the daily life and maintenance of the village. Her key relationship is with Ramurias, who provided her and the other migrants with reassurance and a safe place to live. Through her experiences, Mamu develops from a scared newcomer into a reliable and dedicated member of the village, learning to trust her new home. Notable abilities are not explicitly documented, but her role as a caretaker suggests skills in animal husbandry and childcare.