Mametti is the central protagonist of the Let's Go! Tamagotchi anime, a short series that follows the daily activities of the residents of Tamagotchi Town. He belongs to the Mame family and his birthday is November 23. In this series, Mametti is depicted as an energetic and excitable young Tamagotchi, more spirited and lively than in later portrayals. He is exceptionally intelligent, with an IQ of around 250, and possesses a natural talent for inventing. He often creates gadgets and devices intended to help his friends, though his inventions have a tendency to malfunction or explode in humorous ways. Despite his brilliance, Mametti is tone-deaf and struggles with singing and painting, talents that his friends sometimes gently criticize. His personality is kind-hearted, polite, and easy to get along with, but he can also be short-tempered, especially when frustrated by others’ behavior or when his inventions fail. His motivations are driven by a genuine desire to assist those around him and to solve problems through ingenuity and hard work. He cares deeply about his friends and is always willing to put their needs before his own.

In the story of Let's Go! Tamagotchi, Mametti serves as the main character, and the episodes revolve around his interactions with his best friends Memetchi and Kuchipatchi. The three share a close bond that has existed since childhood, and Mametti often takes on the role of the problem-solver and leader among them. He also shares a friendly rivalry with Kuromametchi, a cooler counterpart. Throughout the series, Mametti’s relationships are central: his affectionate but sometimes exasperated friendship with the fashion-obsessed Memetchi, his easygoing camaraderie with the food-loving Kuchipatchi, and his developing friendship with Lovelitchi, a pop idol who keeps her identity secret. Himespetchi harbors a crush on Mametti, but he remains unaware of her feelings and treats her as a friend. Mametti’s development in Let's Go! Tamagotchi sees him balancing his energetic curiosity with the responsibilities that come with being the smartest member of his group. He learns to manage his occasional temper and to appreciate the value of cooperation and emotional support over pure logic. His notable abilities include his high intelligence, inventive prowess, and the ability to stay calm under pressure when tackling problems. Although not a physical fighter, his quick thinking and creative solutions often save the day. In this series, his single antenna does not yet have the later ability to change color with emotions, but it remains a distinctive feature of his appearance. Overall, Mametti is a well-rounded character whose blend of intellect, kindness, and occasional clumsiness makes him the heart of the Let's Go! Tamagotchi series.