Anti-Cosmo Anti-Julius Anti-Cosma (more commonly known as Anti-Cosmo) is a major antagonist of The Fairly OddParents, one of the two main antagonists of the crossover special The Jimmy Timmy Power Hour 2: When Nerds Collide (alongside Professor Calamitous), and one of the main antagonists of the 2008 film, Fairly OddBaby. He is the Anti-Fairy counterpart of Cosmo Cosma. Like all Anti-Fairies, Anti-Cosmo has the opposite personality of Cosmo, being very smart unlike his opposite.
He was voiced by Daran Norris, who also played regular Cosmo and Timmy's father.