(Tried to make him as accurate as possible).

Sonic is a slim young man. His long black hair is normally tied up in a topknot, and bangs fall over his face. A noticeable feature of his is the purple marks underneath his large gray eyes. He usually wears a tight black latex bodysuit highlighted by metal plating on his shins, arms, shoulders, chest, and waist, as well as a long purple scarf that falls to his legs.

He was seen in a forest, throwing Kunais at a carving of Saitama’s face in a tree.