Simon the Digger, the Leader of Team Dai-Gurren and Spiral Warrior.
Kyle Rayner, the powerful Emerald Knight of Justice and Green Lantern.
These two were once noble men, down on their luck, without a hope of escape from the traps that are their boring, mundane lives. But as fate would have it, Alien objects would be in their possession, allowing them hope of a new life with greater things to look forward to. With their immense willpower and determination, almost nothing is impossible, and they know, they’ll find their ways. But with all that power came great responsibility, and the responsibility to surpass another great hero who they themselves had strong willpower that had inspired the will of their very own, shaping them for a better future ahead.
Reaching the very pinnacle of power they could with their will, determination, and the friends they made along the way, they proved the best knights to take down the most powerful darknesses within their entire universes, taking on immense power of those around them, lighting the darkest hour with nothing but their will.
Kyle gets the White Lantern Power Ring and has access to the Life Equation here.
Simon is EOS here, and can create any of his mechs at will, (including the Super Tengen Toppa Gurren Lagann), with his Spiral Energy.
And if you’re wondering if that’s even possible for Simon to do, it was indeed confirmed in an interview:
"When you see the climax, you can see that Simon himself is Gurren Lagann, isn't he?
Imaishi: That's right. You don't need a mecha, you don't need to combine, you just need one body.
Imaishi: I can't help but feel that way. Because Simon himself has the power. The Spiral Power doesn't come from the robot, but from Simon, and that's the only way to drop it. The robot itself is just an amplifier. It's like an armor."
Fight To The Death.