Vorns before Optimus Primal coined the phrase "Sometimes crazy works", Whirl was living it in action. Whirl believes that, logically speaking, insanity makes an extremely effective weapon. Enemies flee in terror before the absolutely insane maneuvers he pulls on the battlefield. His extreme maneuverability in helicopter mode lets him spin, bob, weave, dive, and bank like someone totally out of control. Or totally out of his mind.
Needless to say, Whirl is a rather reckless fighter and can take damage because of it. He's okay with that, because he absolutely LOVES his job...perhaps a little too much. Many of Whirl's comrades remain unsure if his wild behavior is truly an affectation, or if his increasingly-fleeting displays of rationality are actually the facade hiding a troubled psyche.
Whirl is (or was) a member of the elite Wreckers unit.