The vast majority is definitely very reactionary. I can’t say if they are still aligned with Bolsonaro since he has been losing popularity a lot for some time now, specially because of how he handled the pandemic. But I would bet they are Bolsonaristas, even tho some of them might not like Bolsonaro himself anymore.

I know there is a very, very small minority of leftists in the military police force, but they have to keep their mouths shut not to be extremely harassed, fired or worse.

Not necessarily. The military police and these death squads go back to the US coup in '64. They were aligned with Bolsonaro recently, but they are going to align themselves with any right wing government. Bolsonaro is not all that relevant anymore. He’s under house arrest for now, and he’s gonna be sent to jail soon. He’s been convicted already.