Tengen Toppa Ningen Kami

"The tale of a man who pierces the universe plagued by an endless cycle of violence... without any giant robots!"

A retelling of Gurren Lagann where Simon, Yoko, and Kamina start off their adventures minus the titular giant, super mecha of the original series. While this does put them at a disadvantage, they are not alone for their enemies lack these titular mechas as well. That's it. Except for this one significant change, all of the characters function in the same personality as their original incantations. Except that 90% of all fight scenes will now involve more capoeria, gunplay, swordplay, and explosive maneuvers on foot. The story can be found on Fanfiction.net

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Tropes digging to the heavens:

 * What If: The main focus of the story: what-if the Gurren-dan and the Beastmen didn't have their giant robots?