Triton

Tritons are magical sea creatures who are the male counterparts of mermaids and who are from the home world of Andros with the upper half of a human and the lower part of a fish, and live underwater. However, unlike mermaids who possess fairy-like wings, they appear to have a single fin found over the backbone. Tritons first appeared in Season 5.

Overview
The only Tritons known so far are Neptune, the King of the Seas of Andros, Nereus, the heir to the throne, and Tritannus, the son of Neptune and brother of Nereus, and Season 5's main villain after being turned into a monster by pollution due to an oil spill on Earth, which came through a portal on Earth's oceans. The Winx will have to go on a quest to find the ancient Sirenix power to fight him because their Believix powers are too weak to fight Tritannus underwater.

As it is stated at the end of season 5, Tritannus loses his power when his trident is destroyed, the Tritons' powers may be contained on their weapons, thus lead them to lose their powers if their weapons are destroyed.

Powers and Abilities
The basic abilities of every triton include:
 * Underwater Breathing: They have the ability to metabolize oxygen from the water, which negates the need to surface to breathe air.
 * Speed-Swimming: They can swim for days without exhaustion, in great speed and agility.
 * Thermal endurance: Like their counterparts, they have the ability to endure temperatures far more extreme than would be survivable for a normal human, like the cold of the depths.

Society
The Triton, Neptune rules all of Andros under the Sea, with his Queen being the Mermaid, Ligea and their children are the Princess Tressa and the twin princes Nereus and Tritannus. Neptune is the brother of King Teredor and Queen Niobe and the uncle of Aisha.

Trivia

 * According to Greek Mythology, tritons are a race of lesser mermaid-like half-human, half-fish deities descended from the God Triton, himself said to be half-fish and half-human, who is the son of Poseidon and Amphitrite, the God and Goddess of the Sea.
 * The Royal Family of Andros' mutant form does not differ from the standard Tritons'/Mermaids' mutant form.
 * Unlike the mermaids, the tritons do not receive any changes in appearance in season 8.