Aerobolt is a Weaponizer Mini-Con in Transformers: Robots in Disguise.
As revealed by Starscream in Mini-Con Madness, Aerobolt and his fellow Mini-Cons were captured by the Decepticons in their youth and experimented on. Given the ability to combine with their larger brethren, the Mini-Cons were stored in a laboratory in Darkmount until Starscream stumbled on them. They managed to escape Starscream and fell in with some scavengers so they could escape Cybertron, only to find their new hosts were heading for Earth. They set about trying to work out a way to abandon the scavengers and leave the planet.
Aerobolt is loyal and protective of his comrades. He's untrusting of others ever since he and the Mini-Con were experimented on.