Mari Uotani is a supporting character in the anime Tamako Market. She lives in the Usagiyama Shopping District and, together with her husband Takashi, runs the local sashimi and fish shop. Her background is that of a fishmonger who takes pride in her work, offering fresh seafood to the community and sharing her knowledge of different types of fish and methods of preparation.

Mari is notably more outgoing than her husband, who tends to be quiet. She has an openly friendly and warm personality, often encouraging customers to try their fish and engaging them in cheerful conversation. Her helpful nature makes her a beloved figure among the shopkeepers and residents of the shopping district. She is dedicated to her family and her business, and she understands the importance of community bonds, working to maintain a positive and supportive atmosphere in the market.

Her role in the story is that of a minor but dependable presence in the everyday life of the Usagiyama Shopping District. Mari interacts with the main characters as a neighbor and shop owner, offering friendly advice or a listening ear when needed. She does not undergo a significant personal arc or transformation over the course of the series, but she consistently embodies the spirit of cooperation and neighborliness that defines the setting.

Key relationships include her husband Takashi, with whom she works side by side, and the other shopkeepers and regular customers who form the tight‑knit community. Her notable abilities lie in her expertise with fish and seafood; she is knowledgeable about sourcing, handling, and cooking fish, and she takes care to provide high‑quality products to her patrons. Mari’s cheerful and responsible character serves as a gentle reminder of the strength found in everyday human connections.