4. Trypticon
Hasbro/TakaraNemesis to Metroplex, it can be argued that one would be useless without the other. Metroplex and Trypticon are rarely seen battling any other Transformer, at least in a worthy fight. Curiously, Triptycon is really one of the cult characters of the franchise, his only on-screen appearance being the Generation 1 cartoon (plus cameos in the various Japanese G1 spin-offs). In terms of visual spectacle, having Trypticon, the Combaticons and the Stunticons would be an awe-inspiring sight, as those combiner leaders, Onslaught and Motormaster, had the ability to link up with Trypticon, albeit as little more than kibble. But imagine if you took the Age of Extinction Grimlock, made him massive and gave him a few extra alt-modes and youd get a rough image of Trypticon.