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Tritannus is the main antagonist in the 5th season of the Winx Club Franchise. Tritannus has two different forms: A merman form, which is his original human form and also a beast form. However, Tritannus must absorb pollution from his trident to become a beast.


In his beast form, he has green slimy skin and also has eyes that are colored in red. He still has his lavender mark on his forehead, representing which one is Nereus (His Twin Brother) and which one is Tritannus, as they look very familiar.