Good now we only need away for the two universes to meet and a title on meeting I was thinking something like Dynasty Warriors Gundam where theres a common threat maybe something like another race went with the AntiSpiral way of keeping the threat of the spiral nemesis from happening and it saved/made it possible for the Dark gundam to come back to full power in exchange for the gundam to work for the things cause. That way we could have a reason for the return of the super tengen toppa gurren lagann maybe even make a new version or combining Burning Gundam in the mix causing the possibility of multiable super tengen toppa gurren lagann's to happen do to Domons gundams ability to split into more then one mech
Besides Doman could do like Master Asia and/or Lordgenome and fuck up gunmen without his mech
Anyway what universe are you basing your OC in G Gundam,Gurren Lagann ,both or nether?
Speaking of a combo see how well the two series blend
http://www.youtube.com/watch?v=GcaULPpNFyg
http://www.youtube.com/watch?v=Nclv552LGho
Oh and