Cosmo

Cosmo Cosma is Timmy's male, idiotic fairy.

Personality
Cosmo is usually the cause behind Timmy's crazy adventures, often misunderstanding circumstances, or agreeing to grant a dumb wish. Cosmo's intellect, or lack of thereof, is often a source of many of the disastrous wishes that happen on the show. His head is quite literally empty and has no brain inside to speak of.

Trivia

 * He is one of the only Nickelodeon characters to be dealt with Mpreg (male pregnancy), but since it is the guy fairy that has the baby it is okay.