Masha is a small robot created by Ryou Shirogane and Keiichiro Akasaka as part of the Mew Project. Originally designated by the model number R2000, it is later given the name Masha by the main protagonist Ichigo Momomiya, who names it after her crush Masaya Aoyama. Masha’s primary function is to assist the Mew Mews by detecting Chimera Anima, the monster-like creatures formed when alien parasites infect living hosts, as well as locating Mew Aqua, a powerful substance that can purify environments and heal damage. After the Mew Mews defeat a Chimera Anima, Masha consumes the jellyfish-like parasites that emerge from the defeated host, a crucial step in neutralizing the alien threat.

Masha is capable of limited flight thanks to a pair of small wings, and its appearance resembles a round, flying creature with pink and white coloring. In the original anime adaptation, Masha is depicted as male and is able to speak in short sentences, in contrast to the manga version, where its speech is mostly limited to sounds such as “pi” and “tweet.” Despite its simple communication, Masha shows clear attachment and loyalty to Ichigo, often staying close to her and responding to her affection. A key ability is the capacity to merge with Mew Aqua that the Mew Mews collect, transforming into the Mew Aqua Rod. This rod enables the team to perform the healing attack Ribbon Aqua Drops, which can purify corrupted beings and restore vitality.

Masha’s role in the story is that of a faithful companion and support unit. It does not engage directly in combat but provides essential detection and post-battle cleanup functions. Its relationships are strongest with Ichigo, who treats it with kindness and gives it a name, and it also interacts with the other Mew Mews and the project scientists. Over the course of the series, Masha develops a desire to remain with Ichigo even after the main alien threat is resolved. At the end of the first series, when Ichigo moves to London with Masaya, Masha chooses to stay with her rather than remain with the project. This choice reflects its emotional growth and attachment beyond its original programming.

Notably, Masha is the only element from Mia Ikumi’s original prototype story, Tokyo Black Cat Girl, that carried over into the final Tokyo Mew Mew series, though its role and gender changed significantly between versions. In the prototype, Masha was an intergalactic police officer with full speech capabilities, whereas in the main series it is a robot helper. This background adds depth to its origins as a character designed from the earliest concepts of the franchise. Overall, Masha is a small but steadfast robot whose quiet presence and unique abilities make it an integral part of the Mew Mews’ operations and a loyal friend to Ichigo.