Fairies don't just have fairy forms but, they have have human forms. Their winx or any other form is like the heart to their powers where they become stronger.
The most powerful fairy of all is Bloom, princess of Domino/Sparx. Because of the dragon, magic and even might fairies wouldn't exist.Each fairy stage, the fairy will become stronger than she was at first.
For example,Flora earned her Believix her Enchantix and became stronger than her Charmix.
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Winx fairies