Lucy

Lucy, like most witches, was basically mean and hostile to fairies, but is still friends with Mirta, despite her leaving.

In the episode Miss magix, Lucy wants to compete in the Miss Magix contest, and applies to The trix help. They decide to help, disguising her as a fairy, and sabotage the rest of the contestants, except Stella, who avoids the tricks. When Lucy wins, they betray her and transform her back into a witch (in the 4kids version,Bloom counteracts the spell). Stella is then declared Miss Magix.

in Season 2 we learn that she wants to be like Ms.Griffin , when the trix deicde to use her as a spy to find out where the Cloudtower Codex is-she refuses and attemps to atack them-but fails and has no choice but to do what they say, later she gets helped by Mirta and the Winx but the Trix have already found the Codex.