DJ K-Washi is the boss character of Stage 10 in Streets of Rage 4.
DJ K-Washi is a tall man wearing a futuristic suit with lights which leaves his chest exposed and a helmet obscuring his face. He floats around the corners of the arena and mainly fights with projectiles, using a slow-moving sonic boom, small energy blasts or a large fireball.
He is protected by a force field which the player must break before being able to damage him. Once the force field is destroyed he becomes stunned for a short time, allowing the player to hit him until he falls down, after which he stands up and turns the force field on again.