Breakdown has an acute case of paranoia. (What was that!?) He genuinely believes that things, both living and inanimate, are watching him. (They're all over me!) Breakdown doesn't like to stand out in a crowd. (Did you hear that!?) He dreads being different and garnering attention. (Stop staring at me!) At times, he almost wishes he was a human so he could just disappear and no one would notice. (Get them off meeeee!) Needless to say, he and Red Alert (He's one of THEM!!) would be energon drinking buddies if each wasn't likely to be convinced the other was trying to poison him.
In vehicle mode, Breakdown's engine has got the shakes so hard that it can actually cause mechanical failures in other vehicles. (They're faking!) He can also rely (Ha! As if!) on his concussion rifle if he gets cornered in an alley. As you'd expect, his paranoia is his worst weakness. It's such a problem that the stress can trigger mechanical problems, and it does, constantly. (Oh, yeah, I bet you'd love to claim this was "self-inflicted"!)
Breakdown can also combine (They'll never take me alive!!) with his fellow Stunticons to form Menasor. As if the combiner wasn't unstable enough (It's not paranoia if they're really out to get you!!!), he's forced into working together with Wildrider (Oh god, I have to run together with HIM?) when they form Menasor's legs. In another universe, he is paired with Offroad instead. (Don't believe his lies!)
His alt-mode is a Lamborghini Countach.