User blog comment:Sirenixisthebest03501/Powerful Winx/@comment-27111026-20140503032012

I think the Trix. They don't really gain that much "higher level" or "witch/fairy power" but still over-powered the Winx for various time. And the Winx always have to earn higher power to beat them...

Mostly in magical genre, the villain(s) is/are always stronger than heroine(s).