Diana

Diana is a powerful Major Earth Fairy who resides in the Amazon Rain forest of South America.

Personolaty
Diana is one of the most dedicated to protecting the balance of nature and magic, and when she feels threatened will do anything to protect her domain. Diana was a loyal servant to Morgana and followed her orders with pleasure to take vengeance on the Earth for forgetting the Earth Fairies and harming nature. Diana also shows a gentle and forgiving side, as she recognized that the Winx Club were only trying to help her and restore balance to nature and the indigenous Amazon tribe who revered Diana and the Amazon Fairies. Diana was able to find ways to make peace for the benefit of mankind when she discovered that she and her Amazon fairies were not forgotten.

Season 4
Diana turned Gardenia into a jungle and kidnapped the specialists (except Nabu) causing the Winx to go to her kingdom to save the specialists using their new Sophix powers. And finally the Winx save The Source of Forest's Magic which controls Diana's powers and convince her and the Amazon fairies to stop vengeance against humans.