-Ninja Cat in Episode Two.
Ninja Cat is one of two main protagonists in the NC+MM adventures. Ninja Cat is based off of the creator's cat.
Ninja Cat has a vulnerability to fish, thus causing a trap in Episode Two.
Ninja Cat is a typical cat when not fighting crime. In the beginning of Episode One, she said she hated the news of an army of radioactive mice terrorizing the city of Chalicetown. In Episode Two, she had an idea of what to do during the invasion's second wave, which included escaped prisoners: board up the house, duplicate the food, and have the invasion take its undisturbed course. So far, it is unknown whether or not this plan was used, even temporarily.
Ninja Cat was the first NCMM character introduced, followed by Mutt Man, and preceded by Gurgle from The Ed Times.