Evil League of Mutants

The Evil League of Mutants is the primary antagonist in the titular season 1 episode of Rise of the Teenage Mutant Ninja Turtles. It is a faction consisting of every mutant the ninja turtles have encountered prior to their foundation which is bent on destroying the turtles and taking over the city.

Todd Capybara
Todd Capybara is the owner of a puppy refuge and the only one who is not evil. In the episode Repo Mantis, Repo Mantis sends the Michelangelo and Donatello to repossess Todd's RV. However, they hesitate since it is the only home for Todd's puppies and ultimately make a massive refuge in order to not leave the puppies homeless.

Todd reappears in the episode The Evil League of Mutants as someone who gives the members lemonade, which they all enjoy, even Baron Draxum.