A Monster Resides In Everyone

It's year 3046, and there have been many World wars after the last century.
Nukes bombing the earth have become humankind's least of problems, for they have learned that with a little technology, they can easily inhabit many various planets, and travel at speeds beyond what they could ever imagine a hundred years ago.
Unfortunately, every time something grows, it can overpower some other beings, but they will always be defeated by more powerful beings than themselves.
This 'threat' you ask?
Simple.
Aliens.
Of course, not normal aliens, but aliens that can possess a living creature, or inanimate object, but they dare not to think of inhabiting humans, for it can end in fatal results.
A special organization called AAO, or, oftenly called 'Against All Odds' , is for talented or prophets.
To enter, you must be able to defeat an Kali, or, an alien.
I warn all of you, that before you enter into a heart wretching story as such, you learn of the person we focus on.
Arlo Leighton.
A young boy, no older than age ten, who embarks on a journey that could easily end his life.
But he shows great persistince.
He dare no give up.
For, he is a special case.
Infact, the only one of his kind that lives.
For, Arlo, a once normal human being has defied God.
He escaped the impossible.
And what he is now?
A freak,
curse,
inhuman,
hellion,
fiend,
and, worst of all,
a straight, outright monster.