Kreon Battle Changers!
I really dig that these guys are build-once — they can be transformed between modes without having to rebuild. It just gets a bit fiddly sometimes because a part might fall off while you’re moving bits to get to the other mode. Mostly had this problem with Starscream’s backpack, and Grimlock’s triangular plates beside his feet.
Oh, the little kreons don’t come with the Battle Changers, I just figured I’d pose them with their “super modes”. :)