Replying...
Intro. He is Ryoga, he is very bad at getting angry, it is like the image, Ryoga has a small problem, and that is that when he touches the cold water, rain, puddles or cold water that touches his skin he turns into a black pig, and with the hot or warm water he returns to normal, he has a bandana or yellow scarf with black dots on his forehead but when he transforms he has it on his neck

Ryoga

@Nico