Something that popped into my head when I saw Avengers: Age of Ultron. Well, not specifically this part, but what comes later (hopefully I get that far).
Konohagakure, twenty years post-Kaguya
Winning was overrated. Naruto thought this as he looked at the empty shell of his village. No one but Naruto had taken a step anywhere in the world for twenty years. He stopped counting such things, but if he'd had a mind to notice, Naruto might have realized that he was thirty-seven now. Had been for a few months. It wasn't readily apparent, he didn't look a day over twenty.
Naruto turned away from the village, back to the wide expanse of the Hokage tower's rooftop. The stone the tower was built from was cracking in places, but it was ideal for Naruto's purpose. Spread across the rooftop was quite a complicated array of seals, black and twisting, and reaching to the edge of the circular rooftop and even down the side of the tower in some places. It was a masterwork, Naruto realized, but no one except for him would ever see it; the product of five years of feverish research, coupled with liberal use of clones, Naruto doubted it could have ever been done by anyone but him.
Thinking back on it, the amount of research and work required to reach this point might never have been possible if anyone had been alive to stop him. He hesitated to say that Kaguya had ever done him any favors, but when she wrenched the chakra away from the whole of the human race she'd made pesky things like security obsolete. When Naruto had wrenched the chakra away from Kaguya, it made things like chakra exhaustion and crippling injuries non-existent and annoying respectively.
He looked down at his naked form, covered as it was by even more seal work. That was for later.
With barely an exertion of force, his body erupted into golden chakra. It settled, giving him the appearance of wearing a long coat and a black body suit underneath. The black Truth-Seeking Balls arranged themselves in a circle behind him as the Six Paths Senjutsu took hold. With a long sigh, Naruto started to float, moving upward to get a bird's eye view of his work. There was a small tingle behind his eyes as the Rinne Sharingan was activated. Kaguya, before her death, had demonstrated a power of the Rinne Sharingan, specifically the power to transport herself and other around her to alternate dimensions. Naruto had never found a dimension where anything was alive, and he'd stopped trying years before. It was fruitless, but perhaps the doujutsu would help with what was to come.
He inspected the gigantic seal for any error and, finding none, slowly lowered himself to the center of effects of the Senjutsu faded as he took a seat, cross-legged, in the center of the seal. His hands flashed through hand-seals as Naruto spread his chakra through the seal around him. It would take a massive amount of chakra, but this wasn't a thing that had worried Naruto since Kaguya had died.
The ink around him started to glow brightly as Naruto's chakra suffused it, powered its purpose. Naruto looked on at the remnants of his village as he powered the seal. Nature had started to reclaim the buildings, plants growing on what was once well traveled road, trees growing through buildings. It was the last time he'd ever see it and he took it all in with his stolen doujutsu, appreciating every last detail and memory briefly before it was all gone. Kaguya kept doing him small favors, even from beyond the grave.
When the seal was fully powered, Naruto clapped his hands together. The light cut out abruptly and all that was left was a very elaborate seal on top of a building in an empty village on an empty world.
Texas, 1901
This was a nice place, Naruto decided. The grassland extended in all directions and birds flew in the sky, a welcome sight; he hadn't seen an animal in years. As the wind blew through his shaggy hair, Naruto felt the stirrings of more than just the mixed rage, sorrow, and apathy he'd been feeling for so many years. He felt relief, perhaps even hope.
The seal's purpose had been transportation, although the destination had not been set specifically. There was a chance of catastrophic failure by omitting destination coordinates, but the only coordinates Naruto knew of were on a planet devoid of human and animal life. He'd focused on moving to any planet in any universe that also contained life at the moment of activation. The risk of death was high, but Naruto's sense of self-preservation had faded into the background over time. Whatever this planet was, he at least knew that the seal had worked; the life around him was proof of that much.
Naruto activated the Six Paths Senjutsu once more, taking to the air silently. With the Rinne Sharingan he observed the world below him. There were many types of animals, many of them familiar in their morphology, but lacking even the most basic of chakra networks. This planet was astonishingly similar to his own except for that fact. There was no chakra at all.
With the massive range of his doujutsu Naruto was able to spot a small settlement in the distance. Intelligent life was always a long shot, Naruto figured, but it seemed the beings scurrying about were... people. With a boom he shot like a bullet toward the settlement. He reached it inside of ten seconds, stopping with as much abruptness as he'd set off with. He floated over the settlement and stared down in wonder.
It was impossible for the Rinne Sharingan to deceive his mind, Naruto knew, but he needed a closer look. There were indeed people on this planet. They didn't have chakra, but those were undoubtedly men and women scurrying about below him, going through the motions of their daily lives. He had to suppress the urge to cry. There was still work to be done.
He continued to watch the settlement from above when he noticed a carriage leaving the town, being pulled by two horses and driven by a gruff man. Naruto followed, waiting for them to get a fair distance out of town before insinuating himself in the path of the carriage. He dropped his Senjutsu before the carriage came into view again. It pulled into view and drew to a stop in front of him.
"Whatchu doin' there, fella?" Called the driver. Naruto couldn't understand a word he was saying, but he could rectify that quickly. Naruto made eye contact with the driver and, with the power of the Rinne Sharingan, dove into his mind. The man's knowledge of the world became Naruto's, however limited the knowledge was.
"Sleep," spoke Naruto in his new language. The driver slumped over, asleep immediately.
The door of the carriage opened and a man in a top-hat and a nice suit stepped out. "John, what's the delay?" The man caught sight of Naruto and his eyes opened wide in surprise. It took barely a moment for Naruto to pull knowledge from his mind. He uttered another command and this man was asleep in the road.
Naruto stripped the driver, John, of his clothing and got dressed. The clothing was tight, but the boots fit well. He then gathered the two men and piled them into the carriage before unhitching one of the horses and riding it away.
Texas, 1901
Naruto had stopped at a stand of trees, not too far from the town. An army of clones popped into existence around him and got to work. Chopping down trees and constructing a cabin. Naruto sat on the ground as they worked. He opened his shirt and inspected the ink covering his body. He channeled chakra to the palm of his hand where a new seal appeared. With a puff of smoke a brush and inkwell appeared in his hand while a new clone appeared before him. The clone took the brush and ink and set to work, painting more seals on Naruto's face, connecting them with the rest on his body.
His army of clones had the cabin built by the time the sun went down. He'd sent a few to the town earlier and they'd returned with provisions which included a bed, furniture, and a meal. These had all been acquired via the persuasive power of the Rinne Sharingan. He was abusing its power in these final moments as it would be gone soon. He enjoyed his meal while watching his new horse graze, enjoying the novelty of it after so many years without any company, animal or human. The food was entirely superfluous, of course; when you contained the chakra of the life of an entire planet, you tended to stop needing to eat. Perhaps what came next would rectify that.
Having finished his meal Naruto retired into the cabin, stripping naked once more and summoning a clone. He used an inordinately large amount of chakra to create the clone as it would have a special purpose.
Naruto sat on his bed as the clone finished its final inspection of his seals. It nodded in approval and Naruto lay back on the bed as he started fueling the seals with chakra. This was a seal of a simpler sort, it wouldn't take very much effort to activate.
"Remember, forty years. Give or take one or two," the clone spoke.
"I won't be remembering much of anything important. You know that," he responded. The clone shrugged and gave him a small grin.
"Good luck to us, then. See you around, Boss." The clone gave a little half wave before walking out of the cabin. There was a flash of light and Naruto was unconscious.
There was a flash of light and Naruto was unconscious. He was unconscious for a day or two and when he woke, Naruto Uzumaki felt empty.