Why the hell is there a transformation named after the main character?

"When the Trix attack Linphea, the Winx attempt to fight them but the Legendarium takes their powers away, except Bloom (because the power of the Great Dragon cannot be taken from its keeper), who then shares parts of her Dragon's Flame with the other Winx girls who will have to perform good actions worthy of a real fairy so that they can earn a new transformation"
There you have its called Bloomix because if it wouldn't for Bloom the girls wouldn't have magic powers anymore.Does this make her a Mary Sue because she is so nice?Yes.Is there anything wrong with that?NO.
Here's an article about how all of you should stop hating and bitching about Mary-Sue characters:
link

Exactly that's whats I thought I mean come on how can there be a form on Bloom's name 😶 Bloom is my fav but that's just stupid 😋

Because the author has a serious bias. It's really bad. In my opinion; in good writing you shouldn't be able to tell who the author's favorite or least favorite is. And with winx it is more than clear that he hated his villains and had this wicked boner for Bloom. He always puts her in the spotlight, she's a Sue in every other way...of course she gets a transformation in her name...