Alfea is the most important school for fairies in the Magic Dimension.
Ms. Faragonda is the Headmistress of Alfea. She is a kind-hearted soul who cares strongly for her students. However, she will not put up with nonsense and will dispense discipline when needed. She teaches Convergence to the fairies of Alfea. Faragonda has a good relationship and a little bit of a rivalry with Ms. Griffin of Cloud Tower, another school for witches in the series. In the third season, it is revealed that this is because they, and Headmaster Saladin of Red Fountain alongside Oritel and Marion, had worked together to help defend Domino  from Valtor and the three Ancient Witches. Apparently, Faragonda was friends with Bloom's parents, King Oritel and Queen Marion of Domino, and was deeply disturbed by their disappearance. Faragonda is also a former fairy godmother. She is voiced by Rachael Lillis in the 4Kids version, Larisa Oleynik in the Nickelodeon dub during Season 1-4, and by Kari Wahlgren in the Nickelodeon dub for Beyond Believix (seasons 5-6).
Assistant Principal Griselda is the assistant to Ms. Faragonda and Head of Discipline at Alfea. Griselda is the strictest teacher in Alfea. She teaches the fairies a system of techniques involving defense and reflection abilities as well as new spells. She is voiced by Su Meredith in the 4kids version and by Susanne Blakeslee in the Nickelodeon dub.
Professor Palladium is an elf who teaches Potionology at Alfea. He also is in charge of the Magical Reality chamber, as you can tell in the middle of season one and a couple times in season two and three. Between the first and second seasons, he undergoes an evolution and is now a more confident character with an older appearance. His appearance is similar to the Elves of Tolkien's legendarium. He is voiced by Sebastian Arcelus in the 4kids version and by Mitchell Whitfield in the Nickelodeon dub.
Professor Wizgiz is a somewhat eccentric teacher and Leprechaun who teaches Metamorphosimbiosis, the process of changing from one form into another, to the fairies of Alfea. He is voiced by Pete Zarustica in the 4Kids dub and by Dee Bradley Baker in the Nickelodeon dub.
Professor DuFour is a rarely seen teacher. She wears a large scarlet hat and teaches about "good ways" (manners). She has been seen in a few episodes, including an implication that she was once close friends with Musa's parents.
Professor Daphne is Bloom's elder sister and the Crown Princess of Domino. She becomes the teacher of History of Magic at Alfea in Season 6 after her body was restored in the Season 5 finale.
Professor Avalon is a teacher of Magiphilosophy, a mix of both magic and philosophy. He is also a paladin. It is revealed very late in the second season that Avalon is an impostor working for Darkar and the real Avalon had been trapped in Lord Darkar's stronghold.
Knut was a near-sighted ogre who worked for the Trix, but later turned to the good side out of fear that the Trix will target his kind next. He now is a janitor at Alfea. He is voiced by Marc Thompson in the 4Kids dub and by Peter Emswhiller in the Nickelodeon dub.
Concorda is the guardian of Alfea's Codex. She is bonded to the magic archive of Alfea, where the Codex is hidden within the shelves of books. Concorda loves reading. She also has three pixie pets: a frog, a dingo/fox and a sea horse. She is one of the four powerful pixies in the realm of Magix. She is voiced by Alessia La Monica in the original version.
Mirta is a fairy who used to be a witch at Cloudtower before joining Alfea. For interfering in the Trix's business, she is turned into a pumpkin for the second half of the first season. Flora keeps the pumpkin in her room and takes care of it affectionately, trying several times to turn her back. By the end of the first season, she is turned back into a girl and becomes a transfer student to Alfea. She is voiced by Gaia Bolognesi in the original version, Amy Palant in the 4Kids dub, and by Natalie Lander in the Nickelodeon dub.
Amaryl wears a yellow and green fairy outfit and has pink and orange wings. She has a bit of an attitude and sometimes she is comical. She also almost always wants to be center stage and, depending on the person, can or can't hold grudges for long. Amaryl may have a friendly relationship with Mirta and Lucy, as she can be seen with them at Musa's concert during season two and the three of them are invited by Musa to come on stage with the Winx for the last song. She and Stella didn't get along very well through the first two seasons, as Amaryl had tried to attack Stella in one of their classes. At the end of the third season Stella and Amaryl have put aside their conflicts. She is voiced byRachael Lillis in the 4Kids dub and by Georgina Cordova in the Nickelodeon dub.
Francis wears a harlequin fairy outfit. She might be the fairy of comedy or maybe the fairy of happiness, judging by her costume, or maybe is a vision fairy like Jolly. She is friendly, seeing as she hands tissues to everyone while Musa sings a sad song, but definitely as an attitude has she mocks Timmy when he comes looking for Tecna in one episode of season two, during Tecna's phase of hating Timmy.
Nova is a fairy that debuted in the third season. She has bright orange hair and she is from Solaria. When the Winx girls, minus Stella, are on Andros, she is the one that gives Stella all the latest news about Solaria. She has a high interest in reading everything. She is a fairy of the sun. She is voiced by Monica Ward in the original version and by Cymphonique Miller in the Nickelodeon dub.
Princess Krystal is the princess of Linphea her hair is light pink and she wears a mint green dress. The source of her powers is nature and she also has healing powers. She is voiced by Francesca Rinaldi in the original version and by Cymphonique Miller in the Nickelodeon dub.