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She has dark teal hair and dark colored eyes with a purple mark under her left eye. Zarathustra wears a long turtleneck sweater with a light purple belt across her waist, pants and amethyst boots.
She is dedicated and knowledgeable in witchcraft and is devoted to Headmistress Griffin. Zarathustra is shown to have a bit of an angst against fairies and is rather cunning as she tried to cause them to be more prone to their dark energy and feelings.
When the Winx Club arrived she and Ediltrude scoffed that the Winx Club would be able to handle their stay at Cloud Tower. When the Winx Club were in one of her classes of Mayhem she was trying to trick them into accessing their dark magic and making them prone to negative feelings and more hostile. Until Mirta interrupted the lesson half way through because she knew of Zarathustra's intentions.
In this special Zarathustra, along with her her sister, make their appearances once again as they witness Icy hurling a beam of ice at Griffin, both went to make sure she was alright and she angrily criticizes the Trix for their behavior. Unfortunately, when Stormy conjured up a tornado she and her sister were castoff through the window...
- Zarathustra is an Avestan word and the name of an ancient Iranian prophet and founder of the Zoroastrianism, which was the main religion of ancient Persia/Iran until the 6th century AD when it was supplanted by Islam. Zoroaster is the most common English version of the name. Zoroaster was widely viewed by ancient Greeks as being a sorcerer-astrologer and the inventor of both magic and astrology.
- In the 4Kids version, it was stated that Faragonda and Griffin were in the same grade level when they attended Alfea and Cloud Tower respectively.
- It is also mentioned that Ediltrude attended the Cloud Tower around the same time as Griffin. So Zarathustra is most likely around that age.