Cosmo is one of Timmy Turner's fairy godparents. He is not very bright, and married to Wanda, Timmy's other godparent. Cosmo is also the father of Poof, his and Wanda's baby fairy boy.

He was voiced by Daran Norris.

When Poof was in the Terrible Twosome he kept on biting and destroying Timmy's room but he liked it when Cosmo got hurt.

Many years ago,he and Wanda were replaced by Denzil Crocker with a dog named Sparky.Everytime he would say "UNDERPANTS"he would just go capture them which means that Timmy Turner owner of Fairy OddParents had to rescue them.