Alfea is a fairy school in the Magic Dimension. Students enroll for 3 years and must come with a letter of recommendation, but can be expelled if they break the school's rules.
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 season 3, 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. In season 7, the Winx visit her when she went to Alfea, and Stella almost says that she will be the headmistress.
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.
Knut is an ogre who originally works for the Trix. He is near-sighted; a running gag in the first season is that he has to help the Trix or he will be forced to always wear hisglasses. He later changes to the good side out of fear that the Trix will target his kind next. He then becomes a janitor at Alfea.
Wizgiz is a leprechaun teacher of metamorphosis, the ability to shapeshift into various creatures.
Palladium is an elf who teaches Potionology at Alfea. In an early season 1 episode, the Winx girls remark that he needs more confidence in leading his students. 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 2 and 3. Between the first and second seasons, he undergoes an evolution and is now a more confident character with an older appearance.
Roxy is the Fairy of Animals and the last fairy on planet Earth. She is from the realm Tir Nan Og. Her first appearance is in "The Last Fairy on Earth," the third episode of season 4, when Stella had closed the curtain on her. Roxy has light skin tone, straight waist-length magenta hair with long bangs half golden colored and violet eyes. She has taken birth on June 9. The six Winx Club fairies' new mission is to protect Roxy from the 4 Wizards of the Black Circle, who are after her. Her exceptionally strong magical abilities center around animals, meaning that she has animal-related abilities and spells that take on the forms of animals. She also lives in Gardenia, just like Bloom, and the two are quite close friends. The Winx girls noticed her in the Frutti Music Bar, where she and her father Rick work, and got to be friends with her later in the season. She owns a pet dog, Artu, whom she loves and cares about very much. She despises anyone who tries to hurt him. Roxy is very much her own person and in the beginning it was hard for the Winx to get through to her. She has quite a stubborn, headstrong and willful personality, but softens as she gets to know Bloom and her friends. It is later revealed that she is the daughter of Morgana, the Queen of Earth's terrestrial fairies, making Roxy the Princess of all of the Earth fairies and rightful heir to the Earth fairy throne of Tir Nan Og. At the end of season 4, Ms. Faragonda shows up at the Frutti Music Bar, where Roxy then takes her offer of going to Alfea with the girls and study more powerful fairy magic in the hope of becoming a full-fledged fairy of animals. Her signature colors are lime green and Spring green.
Daphne is the Nymph of Sirenix and derives her magical powers and spells from the sea and the five elements. Daphne has fair skin tone, knee-length blonde hair and light brown eyes. She is the eldest child of Oritel & Marion of Domino ("Sparks") and Bloom's older sister. She is an important character in Bloom's past. She guided Bloom throughout the first three seasons and helped her numerous times, and later assisted her younger sister in restoring Domino and freeing their parents by defeating the Ancestral Witches in the first movie. In season 5, it was revealed that Daphne was the last fairy to have achieved the Sirenix power. Unfortunately, the Three Ancient Witches had cast a curse upon her Sirenix powers, causing Daphne to become a bodiless spirit. Bloom eventually used her Sirenix wish to have the curse of Sirenix broken forever. This successfully restored Daphne to her physical. In season 6, Daphne finally reconnects with her Sirenix powers and orders the beast of the depths used by the Trix to return to the sea. Daphne later enrolled at Alfea as the History of Magic teacher. She is now officially Crown Princess of her home world. She was Thoren's official girlfriend but eventually married to him in the last episode of 6th season. Her signature colors are cyan, light sea-green and light yellow. She took birth on May 3. Further, more of her magical powers are unveiled, she is revealed to derive her Sirenix abilities from the five elements of water, fire, earth, air and Quintessence (though her Air and Quintessence-related Sirenix spells have not been shown yet).
Professor DuFour: 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 Avalon: 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.
Concorda: 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.
Mirta: 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 1st 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 1st season, she is turned back into a girl and becomes a transfer student to Alfea.
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 2 and 3 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 1st 2 seasons, as Amaryl had tried to attack Stella in 1 of their classes. At the end of season 3 Stella and Amaryl have put aside their conflicts.
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 2, during Tecna's phase of hating Timmy.
Nova: A fairy that debuted in season 3. She has bright orange hair and she is from Solaria. When the Winx girls, minus Stella, are on Andros, she is the 1 that gives Stella all the latest news about Solaria. She has a high interest in reading everything. She is a fairy of the sun.
Princess Krystal: The Princess of Lynphea her hair is light pink and she wears a mint green dress. She takes a liking to her childhood friend, Helia. Krystal takes Helia away from Flora therefore leaves Flora questioning her relationship with Helia. The source of her powers is nature and she also has healing powers.