Bellowfire is a bellowback and Diesel's pet.
Upon first meeting him, Bellowfire was hot-headed and aggressive towards Diesel in the fighting arena. He even tries to light him on fire. Only when Diesel cuts him free does Bellowfire begin to calm himself. Confused but grateful, Bellowfire fights alongside his rescuer.
Bellowfire is hotheaded and unfriendly to most of the other members of the team. However, he isn't hesitant to defend them.
Bellowfire is essentially an enormous flamethrower. Most of his attacks revolve around his ability to release a high-pressure stream of ignited Blaze from his nozzle. He can spray this stream directly at an enemy, or around on the ground in a circular pattern to engulf an enemy in a wide, flaming arc. At long range, he can fire balls of ignited Blaze in a trajectory at an enemy. Additionally, he is capable of rushing at an enemy in melee attacks, the speed of which belie his large size and normally plodding gait.
Bellowfire's cargo sac and gullet tanks are his main tactical weaknesses. If ruptured, it will cause a large Fire explosion, inflicting severe damage on the machine and any machine, animal or human in the blast radius. This also deprives the Bellowfire of all his Fire-based attacks.
Trivia:
Bellowfire is named after his species.