So an idea is floating around in my head about a parallel Gurren Lagann world, where Gunmen are not giant robots and are mechanized battle suits instead. Of course the whole series would be slightly different.
This is Simon's design for the fan-fiction series. He is 18 at the start of the series and much like his cannon counter-part is trapped living under-ground along with the rest of humanity, but for different reasons. It has been passed down for generations that the surface is uninhabitable due to a cluster of meteors smashing into the planets surface. The meteors where radio-active and contaminated the surface forcing all of humanity to move into high-tech underground colonies called P.I.T's
Simons job is to repair and expand the walls of the P.I.T just like his father before him. Until one day he finds a small drill object that seems to re-act to his will.
In this series the Core-Drill can expand into a Drill Lance and is Simons main weapon when not wearing the Lagann Armor.
I will be posting the Lagann armor and Gurren Lagann armor soon. If people take interest in this idea I will polish up the concept art and maybe make it into a online comic or animation. You can see the two Simon designs in color here