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Topspin. I think he's the leader of the Wreckers (sorry, there's not much info on him yet).
His profile is below (taken from TF wiki).
'If it doesn't result in at least a few dings and scraped paint, Topspin isn't interested. To him, buckled and burnt armor are signs of a life well-led. He's proud of being one tough bot, and is more than happy to wear the scars to prove it.'
I wonder if he's friends with Ironhide...
I based his robot mode off both his DotM toy and the film version, his transformation I based off the Stealth Force toy.