Coming back from 2002 is Armada Megatron. He retains most of his classic gimmicks but not the knife or his Leader-1 minicon, sadly.
He can unplug the cannon barrel, and use it on his hands as well as combine with micromasters as if they were minicons. To boot he can move his antlers/horns and can convert into his super mode “Burning Megatron”, turning the tank turret to his front and using it like a rotating artillery. We can only hope Hasbro makes a Tidal Wave update that can combine with him because the foundation is already there!
Accessories: Cannon barrel
Height: about 20cm