Reaper Of Reapers:

"So you wanna hear the tale of the Reaper of Reapers, right?"

"Alright soldiers, sit down and listen carefully and prepare to learn of the greatest thing I have ever seen, when I say The reaper of reapers, the killer of those monsters in the sky, you may think of a large Dreadnaught or a giant monstrosity, but that's totally wrong, the reaper of reapers was a man, an elder human, short, doesn't go above five feet tall and bald, had a beard and wore sun glasses, his back was arched and his walk was slow.

Why are you laughing? You think this is a joke, I was there 20 years ago many of us saw him, he had these energy projectiles that cut through these things like butter.

But that's not it, he had an amazing impenetrable defence like superman, his skin was indestructible, any attack from the capital ships couldn't lay a scratch on the guy and it got even worse for them when his body transformed into that unbelievable mass of muscles and grew taller, he was even faster than our own eyes could even comprehend and was laying waste on the reapers with his bare hands and feet, I remember it like it was yesterday, we were cornered by a reaper Destroyer and then he came from above and went through the ship like nothing and then launched a wave from his hand, it was some kind of move, the Kamehameha I think.

But yeah that was the story of the Reaper of Reapers, he helped us defend the planet for about two months before he disappeared, nobody knew his name or where he lived and his face print wasn't registered in our database.
Hey stop laughing private Son Goku I am telling the truth here!"

"Sorry." the spiky haired young man whispered as he rubbed the back of his head.

"And for the last time, remove that red headband right now!"

I know it's pretty short but if you guys want this I can make it into a full story, if you haven't guessed yet, it's Master Roshi who helped them defeat the reapers, as for which ME 3 ending Shepard choose, it's up to you guys.
Thanks for reading and Peace.