Dragons

Dragons are a race of powerful winged reptiles who can breathe fire. They often appear in Fairly OddParents wherein they appear as either antagonists or as the result of wishes or transformations. They are completely immune to magic and because of this Fairies are powerless against them.

Appearances
During one of Cosmo's flashbacks it was revealed that as a child he created a giant three headed Dragon named Snowball who often terrorized Fairy World.

Another appearance was during Timmy's trip to the middle ages wherein his parents (who were poofed to the past as well) were abducted by a large purple Dragon who was terrorizing the kingdom of Camelot and eating all its cows. This same Dragon was later fought by Timmy and King Arthur, although Arthur was quickly killed by the beast he was soon wished back to life by Timmy, Arthur the slayed the Dragon with the sword Excalibur.

Vicky was also turned into a Dragon on one occasion and Timmy was turned into a Dragon-like beast during his Fairy Duel with Remy Buxaplenty.