Who would win this war of mechas? My money is on Kirby and his Robobot armor. It can adapt to anything with its copy ability. It can even....[spoiler]...Perform the Giga Drill Break!!![/spoiler]
That means if Kirby copies Gurren Lagann, then it's game over!
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If Kirby copies Gurren Lagaan, the two will continue to power up until both are beyond human comprehension. Who wins? We will never know...