Fairies are magical creatures that live in the Magic Dimension and are the magical opposites of Witches. Arcadia was the first Fairy to ever live since the begginning of the Magic Dimenision. All of the Fairies of the Magic Dimenision travel to Magix to study at Alfea and discover and learn about their powers. Fairies also have fairy forms. The higher the form, the more powerful the fairies become.
Bloom is the most powerful fairy in the universe. As also her mother, Miriam and her sister, Daphne.
When the fairies graduate they become the gardian fairies of their realms. For example, when Flora graduated it meant that she is the Guardian Fairy of Liphnea.