Constructicons: make mechanic pig as a new character. They could use some of the sprite from AB go, and he could use minion pig sounds. they could have mixmaster and long haul (add a cement mixer/dump truck container to to the back of galvatron's body) and boncrusher (add a bulldozer plow onto heatwave's body)
Onslaught: put a foreman pig head on a green optimas prime body and you have movie onslaught! (uses galvatron movements)
Elita one: Pink matilda with pink lockdown body (uses arcee movements)
Hound: Bomb with soundwave headpeice (- the decepticon logo) on a slightly shorter, army-colored heatwave body. (uses bomb movements)