I got this idea after finishing Tengen Toppa Gurren Lagann.
There's a bit of spoiler in the first part but after that, there's a long stretch before anyone from the main story shows up. Please read and review.
Once there was a war in heaven…
It was fought between prisoners and their jailers.
And it was seen by the entire universe.
Deep within the space of the Anti Spirals rested a column known as the Galactic Spiral Trench containing countless ganmen of Spiral Knights who'd fallen to the Anti Spirals, their energy consumed. However one day, the energy was released to fuel the arrival of a new spiral hero known as Simon.
And the ganmen fell to the stars. Seeds to be planted in the soil of a new generation of Spiral Knights.
It was night, a five year old Shiro looked up at the star filled sky. He smiled at the clusters of stars that hovered above him. He wasn't supposed to be outside, monsters would get him, but it was night and the stars were beautiful.
As he looked up he saw a green streak of light cut through the sky. He gasped in amazement, clasping his fingers and closing his eyes to make a wish.
And then it came true.
As he opened his eyes the sky was filled with the glow of countless green comets. They moved in all directions cutting through the night in a bright collage of light.
And one of them headed straight for him. He wasn't afraid; however, he moved back slightly as he watched, eyes riveted as the green ray of light crashed at his feet into the hard dirt.
He dropped to his knees and began clawing at the dirt. In a few seconds he'd found it. It was a drill, a single small drill with a square hook out the back. It was cool and gray in his hand. He held the key as he looked upwards to the sky.
As he did a massive red machine arose among the stars, with a torrent of green fire rising from its back.
"Even if we were to be enslaved in the galaxy's cycle of rebirth,"
"the feelings that were left behind will open the door!"
"Even if the infinite Universe were to go against us,"
"our burning blood will cut through fate!"
"We'll break through the heavens and dimensions!"
"We'll show you our path through force!"
"Tengen Toppa Gurren-Lagann!"
"WHO THE HELL DO YOU THINK WE ARE?!"
Shiro stared at the giant robot in the sky with wonder.