Brawl wasn't always a Decepticon. He was a miner, like Megatron during the Golden Age of Cybertron. However, destinies change directions and for Brawl. It leads him to be part of the Elite Guard until the War for Cybertron. Where under Ironhide's teaching. Became part of a secret undercover task force, under Ultra Magnus's command known as the Wreckers. During one of their missions. Megatron encountered them and through persuasion. Brawl turned on his comrades. Killing some of them, except for Ironhide. Who still holds a grudge to this day. Brawl's now a explosives expert and always has a big appetite towards explosions. When he does cross with Ironhide, he always makes sure to make the memory of his betrayal all the more haunting for him.

I'd like to see originality with voicing this character.