Over-Run tries to pass himself off as a suave connoisseur of fine things. It's not a façade he can really maintain for long, less because of his generally low intelligence and more because his interest in beautiful objects starts and ends with "blow them up!" His drive to seem sophisticated is in direct conflict with his enthusiastic love of explosions and action. The former is almost always on the losing side of that battle. He’s not interested in the Decepticons' plans for conquest; he's just with them because of the greater opportunities for his kind of fun. He's always on the move, looking to create a bigger fireball, a larger bomb crater, and generally cram every microsecond with action.
He is partnered with the hyperactive Runamuck, and has never had more fun in his life. Marginally smarter than his partner, he also has better self-control, giving the pairing just enough focus to present a real danger to most robots they gang up on.