Unagi Tamai is a supporting character from the anime series Popotan. She is a cheerful and lively girl who lives in the town that the three sisters and their maid visit during their journey. Unagi is known for her energetic personality and her fondness for her pet ferret, Daigu. She becomes good friends with the protagonists, especially the youngest sister, and helps them learn about the local customs. Her role brings warmth and a sense of community to the story, highlighting themes of friendship and connection.