Pixies are a magical race who are known to wield as much power as Fairies. In earlier seasons, they appeared as secondary or tertiary antagonists, much like the Anti-Fairies.
Unlike the Fairies, Pixies treat their magical powers as a business. Their known primary goal is to control Fairy World and Earth, and possibly the rest of the universe. All of their evil schemes are thwarted by Timmy Turner and his fairy godparents, Cosmo and Wanda (and later their son, Poof).
All of the Pixies reside in Pixie World, and they are are all lead by their leader, the Head Pixie, also known as H.P. Sanderson seems to be second in command, and almost always appears by H.P.'s side.
In School's Out!: The Musical, it is revealed that the Pixies are next in line in the wish granting business, and will take over if the children become the dominant species of Earth.
Pixies have magical cellphones in place of wands. They all speak in a gloomy, monotonous tone of voice, which usually lacks most (if not all) emotion. All shown Pixies are male.
They wear grey business suits with white undershirts and black ties, and have pointy grey hats. Their shoes are also black. All pixies aside from H.P. have square heads and wear black glasses.