Sailor Iron Mouse

Sailor Iron Mouse is the first of the Sailor Animamates to appear. Her human pseudonym in the anime is Chuuko Nezu, which is a pun based on mice. True to her name of mouse, Iron Mouse is very short, at least a foot shorter than her targets. She is also afraid of cats. In the anime, Iron Mouse's personality is both childlike and intense; she usually chooses famous or impressive people as her victims, seems to enjoy her work, and is openly terrified of Galaxia. She can warp from place to place using a phone booth that she summons and she can also use it to block attacks.

Sailor Iron Mouse is the antagonist for several episodes of the anime, but is killed by Galaxia as punishment for her failure to collect starseeds.