Garou is a young man with sharp features, yellow eyes, and long silver hair that spikes upward in two large prongs, giving a feeling of a young wolf. He has a lean muscular build. He wears a tight, black, long-sleeved shirt, loose-fitting white martial arts pants, a yellow sash around his waist, and tai chi slippers on his feet.

As Garou fights further in the Human Monster Saga, his appearance becomes more monster-like over time. After being kicked by Saitama, he removes his shirt and wraps his upper body in bandages as he recovers. While fighting Genos, his right eye turns red and bloodshot, and his hair becomes red after he rubs his own blood into it.

Next, he is given a long-sleeved black shirt and tight black pants by the Monster Association. He retains a large diagonal scar across his face after being brutalized by Royal Ripper, and his right eye remains severely bloodshot. His clothes are torn and two strands of fabric flow behind him like scarves due to his encounter with Overgrown Rover, and after being defeated by Orochi his entire body is black with soot. The soot is blown off when Garou blocks Superalloy Darkshine’s Superalloy Bazooka, and the force of the attack also shreds his remaining clothing into a spiral pattern around the hole Orochi put in his torso.