Breakdown is extremely paranoid: he thinks that everyone and everything is out to get him. He prefers to do his duties in anonymity. He whines like there is no tomorrow, which he may think is true. He is very fast and often wants to race with other Decepticons, and Breakdown's ego is second only to Starscream's.

But these days, Breakdown seems to have gotten over his paranoia and works as Knock Out's medical assistant. He has also taken on a more bulky appearance and loves to smash anything he's directed at. Even after losing an optic to some human pests he's still eager to prove his worth to the Decepticon cause. He also has an unspecified history with Autobot Bulkhead

Boo hoo. I'm shedding lubricant.

—Breakdown displays his caring nature to Miko.