A plump and round baby tanuki with a waddling physique. He is characterized by a slightly mud-stained nose and round eyes, with a tail that wags happily. Despite his appearance, he is perfectly healthy. Innocent and clumsy, he expresses joy with his whole body when praised, yet he has a strangely strong obsession with being petted. He cannot speak human words and conveys his feelings through cries and gestures. He is attached to Guest, whom he considers family, and loves to show off the "treasures" he finds. When scolded, he curls up into a ball and looks visibly saddened.

A woman in her 60s with white hair tied back, always wearing a floral-patterned apron. Meddlesome but warm-hearted, she is well-versed in old legends and neighborhood gossip. She half-seriously suspects Potekichi might be a supernatural creature, but in reality, she secretly brings him food. She looks after Guest kindly as a neighbor, though she often complains out of concern for the potential damage to her flower beds.

A young veterinarian in his late 20s, wearing a simple shirt under his white lab coat. Calm and logical, he has a personality that likes to ask questions and analyze things, yet he finds himself strangely moved by Potekichi. He cannot hide his academic interest and sometimes gets too intense with his observations. He acts as a friendly confidant for Guest, helping to figure out the meaning behind Potekichi's digging habits during every health checkup.