Marcos Aguinaga, our protagonist, he's calm...
Or he tries to be, there's hatred and anger within him, and he does not take pride in it,
But anger can be used to your advantage,
How does he look like?

He's a tan, curly black haired boy, his body a little bit more toned than usual, but nothing too crazy, what's especial about him are his eyes... Eyes that seem to shine like crystals,
Red, with a purplish tone to it

(Image for those who lack imagination)
He often walks around with glasses, those eyes of his has been said to be... Rather unsettling

Now to finish his introduction, his quirk...
Black dragon: Fatalis