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Mametchi is a character from Bandai's Tamagotchi franchise, which started out as a simple egg-shaped virtual pet toy and has since enjoyed over 20 years of success, spawning into other media such as video games, merchandise, and anime. More often than not, Mametchi is the result of a Tamagotchi with the best possible care, being portrayed as a very intelligent and well-mannered Tamagotchi in almost all Tamagotchi media. Mametchi started out as just one of many faces, but later on became the mascot of the Tamagotchi franchise as a whole.
Mario Kart Arcade GP 2
Mametchi's only appearance in the Mario franchise is in Mario Kart Arcade GP 2, where he is a playable guest character presumably to coincide with Bandai's then-recent merger with Namco. He is categorized as an Easy-Control character, sharing stats with Ms. Pac-Man and Toad. His special items are Bagubagutchi, a Mame Block, and a Chipi Syrup, and his voice clips imitate the beeping sound effect heard in Tamagotchi virtual pets.
Like the other characters, in addition to a standard kart, Mametchi gets a special vehicle that slightly reduces acceleration in exchange for increased speed. Mametchi's special vehicle loosely resembles a Tamagotchi virtual pet that is pulled by a wheeled mechanical Tamagotchi wearing a Kasa.
Stadium Arena and Waluigi Stadium, in addition to being Waluigi's home tracks, are also technically Mametchi's home tracks, as both tracks feature various Tamagotchi-related advertisements, including cameo appearances of his family (Papamametchi, Mamametchi, Chamametchi, and Bagubagutchi), his friends and teacher (Memetchi, Kuchipatchi, Flowertchi, Makiko, and Ms. Perfect), and the Tamagotchi Planet.