Mauzi, known as Meowth in other regions, serves as a Pokémon member of Team Rocket. Uniquely, Mauzi taught itself to speak human language fluently through painful effort, aiming to impress a female Meowth named Nyarth, who admired human culture. Nyarth rejected Mauzi, deeming the ability unnatural and expressing a preference for humans instead, leading Mauzi to resent humans and join Team Rocket. This intense focus on speech also rendered Mauzi largely incapable of mastering standard Pokémon moves like "Slash."

Mauzi demonstrates fierce loyalty to teammates Musashi and Kojiro, forming a close but often dysfunctional trio. Acting frequently as their interpreter and strategist, Mauzi is highly intelligent, resourceful, and mechanically adept, often constructing complex devices or formulating plans. The character exhibits sarcasm, cowardice, greed, and vanity, frequently dreaming of wealth and comfort. Despite a tough exterior and sharp tongue, Mauzi shows moments of sentimentality and deep care for Musashi, Kojiro, and occasionally others.

Mauzi's primary motivation is aiding Team Rocket's mission to capture powerful or rare Pokémon, especially Pikachu, for their boss Sakaki, a pursuit that is constant but rarely successful. The character often provides comic relief through exaggerated reactions, failed plans, and bickering with Musashi and Kojiro. Mauzi occasionally experiences existential doubt or regret about the criminal path chosen after Nyarth's rejection, sometimes longing for acceptance or a simpler life, yet consistently reaffirms loyalty to the Team Rocket trio. Mauzi's appearance matches a standard Meowth, distinguished solely by a scratch on the gold coin adorning its forehead, a mark acquired during the painful effort to learn human speech.