Needs a Gurren-Lagann/Shugo Chara crossover.
Easter creates a giant robot Amu and starts destroying the city, and Amu has to fight it, but isn't strong enough. As she and the others find safe shelter somewhere, they begin to lose confidence, until a dot is seen flying in from far away. It's the GL and Simon gets out and talks to Amu and the others, telling them he's here to help. He says he needs Amu's help so he puts her in the Gurren cockpit.
They GATTAI with the Giant Amu robot to form the "Giant Amu Gurren-Lagann" and the day is saved. Amu becomes the pilot of the Giant Amu Robot and they use it to save eggs and shit. Then Simon warps back to his own story and timeline.