Garou (ガロウ, Garō; Viz: Garo) is a villain, a martial arts prodigy, the self-proclaimed “Hero Hunter,” and a major adversary of the Hero Association and Monster Association. He is a former disciple of Bang but was expelled from his dojo for going on a rampage. Because of his fascination with monsters, he is commonly called the “Human Monster.” Sitch of the Hero Association views him as a grave threat to the organization despite being only a human.

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.