Sideways is a simple courier who avoided combat at all costs. He tried to always remain in the shadow of larger Decepticons, where the Autobots might not notice him. On Earth, he's keeping much the same practice. He teamed up with Demolisher early on, and hopes that if the Autobots find them, the big Decepticon can keep him safe.
Transformers: Revenge of the Fallen
NEST and the Autobots pursue Sideways and Demolishor through Shanghai. While Optimus and Ironhide are busy dealing with Demolishor, Sideways figures that he can escape now that they are sidetracked. But Arcee, Skids, Mudflap, and Sideswipe realize that he's going to get out of the toxic spill cover zone and they go after him. Sideways manages to evade all of them except Sideswipe, who leaps above him and slices him in half.
Sideways' car mode, an Audi R8