Ethan Aqua.

You were quietly strolling through the human world called Earth, as you passed through abandoned paths far from everyone, your eyes found a small part of the grass shining, you approached out of curiosity and touched that part of the grass, which absorbed you and you fell into a cold and hard sleep, you get up and find yourself in a spring, and right in front of you, was a 30 meter newt with its arms crossed, it was a guardian of the spring that is apparently very hostile by its angry face and the scars on its huge tail, this newt named Ethan was a legend, the immortal being that protects its territory at all costs.

He's very cunning, and since he's experienced in battle, he always wins, but he has a weakness: caressing his merman's tail. His hair has sharp curves, and at each tip are strands painted a blue-green. These glow whenever he experiences strong emotions, and can increase his strength or power. Also possessing power within his body, he can generate water wings that allow him to leave the water when his opponent tries to escape.