You liked the world tournament idea? Thanks! I was mainly thinking that the next CR game could have you travel to more areas around the world for both Tournaments and stopping the crime syndicate. We already had the Dread Army, Goliath,
Nikaidou Group, Z Syndicate (though it was originally good), and Greybaum. I wonder what the next one would be. Also, where in the timeline would it take place? IIRC, the timeline is Custom Robo 1, V2, GX, Arena, then Battle Revolution (I could be wrong though). In my honest opinion, it should take place either right before or a little bit after Battle Revolution (either before Rahu came to the world or after the people of "the dome" started to go outside more). I'm saying after personally as it gives the series more room to maneuver timeline-wise.
Rebirth sounds pretty good too! It would fit the idea of the dome people going back outside and having humanity being born again in the outside world.
I liked Arena's artstyle a lot as well. For me, it's between Battle Revolution's edgy style and Arena's semi-edgy semi-anime style. I don't mind either at all.
Those names are pretty good as well! Wished I was more creative when giving names.
Grand Championship sounds like the best one outta all of the ones you mentioned IMHO. I mainly want the plot to be both about the tournament AND the criminal organization. I liked Battle Revolution and Arena's villains the most to be honest. They felt really evil/corrupt. However, the other 3 groups were pretty good too. Dread Army wanted nanomachines to boost their physical strength to take over the world, Goliath was a splinter group of Dread Army, and the Nikaidou Group wanted to replicate the best commanders' brain waves to create an army of autonomous robos. I still think Z and Greybaum were the best 2 syndicates overall though.
I still have hope for him (any model) being DLC. The fact that there was no mention of him, the Custom Robo series, or Isaac in the 3ds version leads me to believe that he'll either be an assist in the Wii U version or an eventual DLC character (or maybe a Cross Console Connect Content Character [C5]). That being said, I wouldn't be surprised if he wasn't chosen as a playable character this time around....
But I still have hope.
I agree that he's very overshadowed compared to other characters, but I still think he has a chance at making it in as DLC. It is a slim chance, but it's still a good chance.
I THINK GX for the GBA is 2D, but that would be an interesting idea.