The Gunrilla is a Sirian mutant with a mix of a gorilla. Its head that has been replaced with a gun, and it fires cannonballs, which can explode it close range. However, all of this comes with a price; the Gunrilla is fairly slow, making it easy to avoid.
The Gunrilla only appears in Ancient Rome.
- Powerful weapons such as the Minigun, Rocket Launcher or Time Strike are needed to kill a Gunrilla. It has a lot of health and its projectiles are quite deadly, so the player needs to use powerful weapons in order to kill one in a good amount of time.
- Multiple Gunrillas need either a Minigun or the Rocket Launcher to deal with them. The Minigun's rate of fire is fast enough that it can deal a lot of damage to multiple Gunrillas, while several rockets to a pack of Gunrillas can kill multiple ones because of the damage that an exploding rocket can do to nearby enemies. Other weapons are too weak to kill multiple Gunrillas before they flood the player with projectiles.
- When paired with other enemies, the Gunrilla is a high-priority threat. Its projectiles can do a lot of damage per projectile, and it can absorb a lot of damage before dying. Killing it ASAP will make it much easier to kill other enemies.