Cosmo is Timmy Turner's fairy godfather. Along with his wife, Wanda, he was tasked with making miserable human children happy by granting them wishes and keeping them safe. Unfortunately, due to Cosmo's immense stupidity, he often times puts Timmy in danger with his wishes, or misinterprets the wording of a wish and grants it wrong, wreaking havoc. At one point, he was responsible for sinking Atlantis numerous times. Despite his stupidity, and a tenancy to argue with Wanda, he really does love his wife and his godchild. He often goes along with Timmy's wishes unlike Wanda who is a little strict about them. He and Wanda have a child together named Poof. Prior to Poof's birth, Cosmo was the last fairy baby due to the destruction he caused as a baby.
Cosmo has green hair, green eyes, and wears a white shirt with a black tie, and black pants and shoes. Like all Fairy Godparents, he has a magic wand, fly-like wings which allow him to float, and a crown floating above his head. Cosmo seems to have gotten most of his appearance from his long lost father, Papa Cosmo. In this fanfic, Cosmo's voice is not as high-pitched as in the main show's later seasons.
Clefto - Cosmo's superhero alter-ego in the Crimson Chin comics.