Knock Out isn't much of a warrior. He's been in plenty of fights, but mostly to save his own hide. A con-man at Spark, Knock Out would rather be doing shady deals in Cybertronian back alleys than fighting in a war, but when Megatron tells you to do something, you do it. Even if it means having to buff the dents out of your chassis later. 

Knock Out was a stand-out character in "Transformers: Prime", so I couldn't resist bringing him in here. He loves himself more than anything, and if he can find a way to get out of something, he will. His voice should drip sleaze, as he's the used car salesman using his business as a front for something that's probably illegal while being the car on the lot in question.