Maybe make him this leader who just tired of everything. A leader in which the war's taken a toll on. He cares deeply about his Autobots and everyone who looses their lives of course, but more like someone who just wants the war to be done with. He finds it difficult to connect wirh his soliders and doubts himself as a leader and just wishes that this responsibility that was thrust upon him was lifted off his shoulders. He can barely look at himself in the mirror, only reminded of all the lives he's taken. Whenever someone tries to talk to him about it, maybe a close friend like Ratchet from Prime or IDW, he just says he's fine and gives a tired smile. I want an Optimus who'll do it for the greater good, but it breaks him every step of the way.