Masha (マシャ) is a robot created by Ryou Shirogane to detect Chimera Anima and Mew Aqua. Originally called by the model number of R2000, Ichigo nicknames R2000 "Masha" after her crush Masaya. Masha likes the new name and likes being with Ichigo. When the Mew Mews defeat a Chimera Anima, Masha eats the jellyfish-like parasites that come out of the infected animals, plants, and humans. Masha can also merge with Mew Aqua found by the Mew Mews to transform into the Mew Aqua Rod, allowing the Mew Mews to perform the Ribbon Aqua Drops healing attack. Masha does not have the capability for high level speech, primarily saying "pi" and "tweet." Masha is occasionally shown saying regular words, with the most advanced being seen in Tokyo Mew Mew a la Mode where it says "Masha is going with Ichigo!"

Masha is the only character in the series to also appear in Mia Ikumi's short story Tokyo Black Cat Girl, which would eventually become Tokyo Mew Mew. Though Masha has the same name and general appearance in both series, in Tokyo Black Cat Girl Masha is a very different character. Instead of being a robot, Masha is an intergalactic police officer who partners with Princess Azumi to defeat alien parasites called the Baku. Masha has the ability to change disguise as a cell phone mascot, can speak in complete sentences, and is capable of fighting the Baku in small numbers.

In the Tokyo Mew Mew anime adaptation, Masha is capable of speaking in short sentences and is shown trying to help the Mew Mews when they fight. In the original Japanese series, Masha is voiced by is Junko Noda. In the Mew Mew Power English adaptation, Masha's name is changed to Mini-Mew and is voiced by Tom Wayland.

(Source: Wikipedia)