Being the opposite of Cosmo, Anti-Cosmo is much more intelligent, cruel, malicious, diabolical, manipulative and most of all evil.

However, most of his plans are destroyed either because of Timmy and his efforts or because of Anti-Wanda, who reveals his plans to others. Despite the setbacks, Anti-Cosmo rarely gets upset and sometimes starts thinking about things that don't go his way. Anti-Cosmo does not believe in fair play and very often goes to deception just to win.