Disclaimer: I don't own NONE of Naruto, Naruto Shippuden or Avatar: The Last Airbender. NONE of the Comics, Manga's, Series, Characters and Etc.
Author notes to readers: For now and the future reread form the beginning because I might add or change something. Also I'll try to do at least 1,000 words for each chapter. Yeah a 1,000 words might seems a lot but trust me this Crossover Fan-Fiction will take a while. I'm not even sure I'll be able to finish it.
_Fan-Fiction Begins Now_
The Nine Tails Fox Demon attacks The Hidden Village of The Leaves, destroying much of the village and taking many lives. The leader of the village, the Fourth Hokage sacrificed his life to seal the Nine-Tails into a newborn, Naruto Uzumaki. Orphaned by the attack, Naruto was shunned by the villagers, who out of fear and anger, viewed him as the Nine-Tails itself. Though the Third Hokage outlawed speaking about anything related to the Nine-Tails, the children — taking their cues from their parents — inherited the same animosity towards Naruto.
Fast forward five years later on Naruto's Fifth Birthday, young Naruto was having a horrible day. As far as he could remember every time it was his birthday nearly all the older generation will be extra cruel & hateful towards him.
Naruto's Personality: Naruto is a lot smarter than people gives him credit. He has to be in order to survive in a shinobi village where majority of the populace hates him. Another thing Naruto knows that he's being kept in the dark about a lot of things. Lately Naruto has really starting to resent The Leaf Village.
As Naruto was being chase out the village, he decided to hide at one of the training grounds and lay low till tomorrow. Since Naruto is still young and he doesn't have anyone to train with, He hasn't been to a lot of the training grounds so Naruto unknowingly choose The Forty-Fourth Training Ground aka The Forest of Death.
The front gate happens to be open so Naruto ran straight through without a second thought. The angry mob consisting of mostly civilians, some chunin and a few genin came to a immediately stop at the front gate.
The reason why there's no Jounin or ANBU for the annual Fox Hunt is because The Third Hokage has stated that the higher your rank is the more serious your punishment will be for attacking Naruto.
The civilians & genins heard terrifying stories of The Forest of Death and the chunins remembering how they barely made it out of there alive when they was genin. They decided to call it a night and let whatever's behind those gates finish the job.
Naruto begins to slow down his past when he realize the angry mob wasn't chasing after him any more. Being the curious little fellow that he is, Naruto choose to do some exploring. While looking around Naruto saw a lot of unique plants but knows better not to touched any of them because they might be poisonous. Naruto could tell there was something weird about this place because he hasn't seen a single animal yet & Naruto felt that he was being watch.
About fifteen minutes of walking around seeing nothing special but plants and trees also hearing a couple sounds here or there Naruto begins to get bored. Since it has been such an exhausting day both emotionally and physically and it's probably around 10 O'clock Naruto decided fall asleep under a tree.
Yes, I know that some of you are wondering how can a five-year old survive in the Forest of Death for a entire night. The answer is quite simple, Naruto had a sprite watching over him that night but not just any sprite it was the Shinigami.
1 Hour Ago, The Shinigami appears out of nowhere at the front gate of the Forest of Death. The Shinigami noticed that it was chained shut so the demonic sprite unsheathe his tanto then slowly raised his arm high with the tanto in his right hand, then with a quick vertical slashed downward at the chains causing it to fell on the ground as he resheath the tanto.
The Shinigami raised his hand towards the gates then thrust forward causing a huge gust of wind to ram open the gates. Now that the gates are open, The Shinigami waits paitently for The Child of Prophecy. Twenty minutes later the Shinigami could see & hear Naruto being Chase by the crowd of insufferable humans.
Apart of him wanted to slay the entire crowd for unjustified harassing and tormenting an innocent child, but even he the God of Death must follow the rules. Naruto was running for his life toward the gates, while a horde of people is after him. Once Naruto made it pass the gates the Shinigami released a small amount of killing intent at the angry mob.
Even though none of them was aware the Shinigami they all felt threaten. The group of humans begins get terrified. None of the civilians wanted to go inside that forsaken place, a few of the idiotic chunin & genin where about to continue pursuing the Fox Brat until their bodies where paralyzed with fear.
Since none of them wanted to enter the Forest of Death and they knew there's no way in hell the Demon Child could survive in there, so they decided to call it a night and let whatever's behind those gates finish the job.
Now that the other humans are gone the Shinigami turn around begin to hover into the Forest of Death to fine & look after Naruto Uzumaki. The Shinigami was following Naruto and releasing enough killing-intent to scare off all the creatures that might cause harm to Naruto.
The Shinigami has absolute control over his killing-intent so that it will effect everything except Naruto, also being careful not to use too much that it could draw some unwanted attention from the ninjas in the Leaf Village.
The real reason why the Shinigami came here to protect Naruto on his Birthday is to make a deal with him, the Shinigami floats towards Naruto and place a hand on his forehead in order to enter his subconscious.
Despite being in a terrifying place Naruto felt safe and went soundly to sleep. Thirty minutes of Naruto dreaming about ramen because he went to bed hungry. Then all of a sudden everything went black.
When Naruto wakes up he notice that somehow he's in another location. This place looks like a basement of an industrial plant, with pipes running along the ceiling and the floor — the latter of which was flooded by water.
His common sense was telling him this place is bad new but apart of him wanted to find out about this place plus Naruto doesn't know how he mysteriously arrived here and Naruto has no ideas on how to return to The Hidden Leaf Village.
Then as if he was strike by lightning Naruto came to a realization. He has no actual responsibilities or alliances with The Hidden Leaf Village and no family members there. Plus by leaving the village Naruto will have a blank slate any where he goes & if he's lucky Naruto could find someone to train him.
There where only three people in the entire village that treated him kindly The Third Hokage, Teuchi & Ayame. Now that Naruto thinks about it he has a few reason to leave them. Naruto knows The Third Hokage has been keeping secrets from him also the old man won't always be around forever so without The Third Hokage who's going to stop the people & shinobi from targeting him.
Yes, Teuchi & Ayame has been very kind and generous towards him but if Naruto leaves The Hidden Leaf Village they might regain their customers they lost for helping him. After going over the pros and cons Naruto decided to leave The Hidden Leaf Village. Now step two figuring out where he's at and where does he want to go.
So Naruto begins exploring around this abandoned run down sewer. As he continues to walk down the hallway the lights starts to become brighter until Naruto enters this humongous room. Naruto guesses whatever is behind those bars must be extremely big or dangerous or both, Naruto has no idea how right he is. Naruto begins to cautiously walk forward to get a better view until he hears what or who ever it is breathing.
Here's the weird & disturbing thing, Naruto only made it to the middle of this colossal sizes room and he can hear something breathing. Naruto might be curious but he's not stupid so he turned around to find a the different exit, until a demonic voice shouted "Naruto Uzumaki! We finally meet, come closer." Naruto compelty froze still then hesitantly turns to see two enormous bloodshot eyes glaring at him.