The Poacher King is the main villain and final boss from Growl. This mysterious figure is the leader of the poachers whom the Ranger Corps fights throughout the game. He initially appears as a masked hunchback wearing a ringmaster attire and equipped with claws. When the players face him, he will come out of a tank and nonchalantly lift up the tank with his hands to throw it at the player. He mainly attacks by jumping around, shooting from his claws and from a rocket launcher hidden on his hunch.
In what's likely the weirdest plot twist ever, once he is defeated his corpse starts moving, and his hunchback bursts out to reveal a large worm-like monster, which is revealed as the true boss behind the poachers. On this form the boss remain stationary, only spinning around and occasionally shooting a explosive fireball. Once it is defeated it explodes, and all animals captured by him are freed.
- The name of the poacher organization is Belsar Corporation of Animal Protection.