Skids

Skids is pretty useless in a fight, it seems.

The dopey-looking Skids spends a lot of his time arguing with his twin brother Mudflap and trying to outdo him in crazy stunts, all while believing he's the responsible, level headed one. In his own mind, everything dangerous and dopey he does is simply making him a better warrior. And that means one day, one glorious day, Optimus Prime will notice him! Prime even looking in his direction makes him babble, fall over, and generally fail to make an impression, but that won't stop him trying! Underneath it all, he harbors a secret fear that Mudflap is actually the superior warrior of the pair... which is probably true.
Skids' hyper-reactive optical imaging scanner allows him to process tactical information faster than anyone (except his twin). Add that to his supreme firepower and his unpredictable actions, and he's a pain in the aft for any Decepticon who wants to counter him! And that's only if they spot him. He changes alt-mode so much it's hard to keep track of him. On Earth, he's already been part of an ice-cream truck (combining with his brother), and more recently a Chevy Beat, but that's unlikely to last very long.