Somehow I got myself roped into watching the intro to Stardust Witch Meruru, and that got me thinking about an original "magical girl" character in my head, and how odd it would be if she ended up with what would be essentially be the Matrix of Leadership but "cuter" even though this character of mine is to do away with anything cutesy.
So I decided to Google the Matrix of Leadership for kicks and found this. There is a gallery of an OC having a (mutual!) relationship with Optimus Prime of all people. Plus that first image...I have been reading Exiles recently, and I know that is meant for the Aligned continuity but I don't see why this wouldn't apply anywhere else. The book often stresses that the Matrix pretty much only reveals itself when it chooses to (though it wouldn't explain that one scene from DOTM).
Still, it just seems so unlike Optimus to be romantically involved like that. I think I see why the "Romance with canon character" Mary Sue is so reviled.