In this game with Sonic the Hedgehog and Knuckles the Echidna, Knuckles battles Egg Robo and destroys him.
Knuckles can climb walls, break through bricks with his fists and glide through the air for a limited period.
Step 1-
To draw Knuckles, I began with grey guidelines. A large circle, flat on top, for his head, an oval for his snout and 2 large ovals for his fists. The rest is a stick figure fleshed out.
Step 2-
I used a transparent fill for the colors (reduce the opacity to 50% by moving the slider) and later use the airbrush for shading.
Step 3-
A thick pencil line in a darker tone of the same color helps give it a neat finish.