[@Renny] Why's that? I mean I kinda tailor made that one to be the Crossbone Joker's rival. Surely it's not just because of the whip sword being similar to the Barbatos' tail?

In any case, those are just a mere three suggestions. We can always insert more enemy Gunpla. Hell an entire team came to mind while I was in the shower earlier. It basically stars the Phantom Rogue on a team full of Phantom Thief archetypes. The Rogue is based on Arsene Lupin, another member can be Ninja-esque and based on Goemon Ishikawa. Another member can be an archer type and based on Robin Hood. You get the idea.