From here

Starting with Motormaster!

Headcanon 1:  Realistic

Motormaster tries to be very meticulous with the care and upkeep of his sword. "Tries", because it's not like anyone's ever taught him how to actually do that (not that he'd listen to any advice anyway) and of course he wouldn't ask anyone for pointers.

But his weapon is something that is solely his and under his complete control. I'm sure that says nothing else about his mental state and how he views others.

Headcanon 2: May or not be realistic

Socially awkward on the rare occasion he deigns to try and join in. When he doesn't have something to boast about or a way to act tough, then he's keenly aware of the fact that he's not well liked and doesn't fit in for it.

Headcanon 3: Evil and heart-breaking why would you do this

Blames Menasor for most of his problems. And his teams' problems. Maybe if they hadn't been made as a combiner, and with Menasor as part of them mucking everything up, they could all be normal and be the superior soldiers they were meant to be.

Headcanon 4: Doesn't align with canon

He does have the capacity to change and be better, especially with regards to how he treats his team, but it will definitely take an outside party to help facilitate that change. Onslaught could be a good role model for him, given the opportunity.

And now Bonecrusher

Headcanon 1:  Realistic

He and Hook are more alike than either of them care to admit out loud. This is, of course, why they butt heads so often; the similarities and the refusal to accept them.

Headcanon 2: May or not be realistic

Had a string of shitty bosses before eventually joining up with Scrapper. His respect and decent treatment gained him Bonecrusher's loyalty.

Headcanon 3: Evil and heart-breaking why would you do this

Not to sure what to put here...

Headcanon 4: Doesn't align with canon