He is the Key. The Key to Salvation. The Key to Destruction. Oh, and he is a scarred kid who has no clue why he has been dragged into all this.
Matthew is and has always been pushed around his whole life. His parents were jackasses, who told them he wasn't special. He was a loner in a way. Always told he is average, nothing special. Truth is, they were all wrong. So very very wrong. Matthew has a gift. A powerful one. But if someone ever took control of him, it could mean oppressive domination. For you see, he is able to control energies. Now, on their own, they would do nothing. However, there is a giant space-time rift that stretches throughout the universe. These energies allow him manipulation of The Rift. These powers alone make him formidable. Definitely not invincible, but it makes him a major pain in the ass.
This gives him the ability to affect time and space. This power, if enhanced, and controlled by someone who didn't know what they are doing, could result in total chaos and destruction. But in the right "vessel", without modification, it can be maintained and under check as long as there is no excess ordeal or stress.
Whatever he can carry in his backpack.
He doesn't talk about where he came from or anything from his past. But people are after him. His powers have caused him to get their attention. Mob bosses, Government Leaders, Crime Lords, Rich Powerful people. Pretty much anyone you could imagine. His gift is unique. So he is hunted across the universe.
And he is only like, 9-10. Again, he doesn't say. But he knows how to fight. He knows how to use his powers. He just might not always have total control.
Whats worst is that he not only didn't choose this life, he never wanted it. His parents abandoned him because of his power. People hunt him for it. He is pretty much wanted everywhere. The only reason he hasn't been caught yet in his power. He is on his own. No human generosity thus far.
His life sucks. To put it Blatantly.