I also decided to make a Winx witch character to show what I would do with their 'transformations', which we never get to see in the show proper.
The first is, of course, her civilian form. Very normal, very usual, nothing much to say about it.
But the second is her witch form which also features a Gloomix, which is equal to fairie's Charmix. Witches obtain theirs by being able to summon a familiar and bonding with it. (no Darkar required but makes the process easier)
The third is their Disenchantix. A witch obtains a glowing brim around their head that works similarly to a Fairie's dust bottle. Enhancing their power and able to break or strengthen various spells. The brims can be implemented into a traditional witch hat, which will then be included into their Disenchantix transformation. Witches obtain their Disenchantix by going to the very core of their power, spiritually, and touching it. It requires a great deal of discipline and shows that a witch is fully ready to embrace the destructive, negative power within themselves, and be able to handle it.
