Anti-Cosmo calls Cosmo an "ignorant boob" many times in " The Gland Plan".
Although Anti-Cosmo is the opposite of Cosmo he still loves his wife, Anti-Wanda, and son, Foop.
In other similarities he as with Cosmo is that Anti-Cosmo is also very powerful as him, and their both destructive but by Cosmo it's only Random or by accident, while Anti-Cosmo spreads misery on purpose
In " The Jimmy Timmy Power Hour 2", Anti-Cosmo's canine teeth are jagged ones. In Balance of Flour his canine teeth look like Foop's teeth.
Anti-Cosmo is one of the main antagonists in the edition of Gameboy Advance Breakin' Da Rules.
Apparently, Anti-Cosmo is a sore loser as seen in " Balance Of Flour".
Anti-Cosmo occasionally calls other characters "Clarisse" (notably The Gland Plan when he doesn't have his monocle on and calls Wanda "Clarisse"). This is a reference to the movies.
Hannibal Lecter Throughout the series, Anti-Cosmo's canine teeth change into different fangs.
His Bowler hat changes shape in almost every episode that he is in.
He is the second person/fairy to have a body similar to Timmy's, the first being Cosmo.
Anti-Cosmo has a tendency to say "Tally ho!".
His laugh is more evil than the Head Pixies laugh is.
He did not have Foop while Cosmo had Poof.
Unlike Cosmo, he doesn't call Timmy by his name, instead he calls him Timothy which is Timmys first name.
He is the only character who was present for the birth of Foop and Poof ( though he was disguised as Rip Studwell for Poofs birth)