Rumble was one of the original Decepticons from the first Transformer toy assortment. Though little, he was feisty and could shake the ground by turning his arms into piledrivers, hence the name. He was identical to his twin brother Frenzy in terms of build, abilities, and even voice, but in terms of colour, they were different; Frenzy was blue and Rumble was red. Upon their transition to TV, their colours were reversed by some unknown error. It's best not to bring this up in a Transformers community.