Naruto's Mangekyō Sharingan (Please Vote!)

"System, exchange for Bloodline Upgrade Scrolls and use them to upgrade my Uchiha Kekkei Genkai!"

"Ding! Uchiha Kekkei Genkai upgraded to level one. Host has unlocked the One-Tomoe Sharingan."

"Ding! Uchiha Kekkei Genkai upgraded to level two. Host has unlocked the Two-Tomoe Sharingan."

"Ding! Uchiha Kekkei Genkai upgraded to level three. Host has unlocked the Three-Tomoe Sharingan."

"Ding! Uchiha Kekkei Genkai upgraded to level four. Host has unlocked the Mangekyō Sharingan."

Naruto had exchanged for four Bloodline Upgrade Scrolls in one go, raising his Sharingan straight to the level of the Mangekyō Sharingan.

But when he tried to upgrade his Uchiha Kekkei Genkai again to obtain the Eternal Mangekyō Sharingan, the system chimed in:

"Ding! Uchiha Kekkei Genkai has reached its maximum level. To obtain the Eternal Mangekyō Sharingan, prepare another pair of Mangekyō Sharingan, then exchange for and use a Bloodline Synthesis Scroll."

Naruto mulled over the message before finally accepting that his dream of obtaining the Eternal Mangekyō Sharingan in one go would have to wait.

There were only three pairs of Mangekyō Sharingan in the entire Shinobi World right now. Even counting the pair Sasuke would awaken in the future, that made only four.

(Madara's eyes could be considered Rinnegan. Even if Naruto took them, all he would get was a pair of Rinnegan.)

Which of those four pairs should Naruto choose? And which could he actually get?

After thinking it over, Naruto set aside the idea. For now, it was too far-fetched. He was no match for Obito, Itachi, or even Danzo.

He might as well see what abilities his own Mangekyō Sharingan had first.

The Mangekyō Sharingan was said to reflect the heart. Its abilities differed from person to person, revealing their deepest desires.

Naruto discreetly used the Flying Thunder God Technique to reach a deserted stretch of river. He looked down at his reflection, wanting to see what his Mangekyō looked like.

What greeted him first, though, was a boy of about twelve with yellow hair, a reasonably handsome face, and three whisker marks on each cheek.

This was what Naruto Uzumaki looked like, much the same as in the original story.

"But what did I look like before?"

His reflection gradually blurred.

Only now, months after arriving in this world, did he realize again that although he was Naruto Uzumaki, he also wasn't.

His home was on another planet. There were no Ninja there, but there were televisions, phones, computers, airplanes, tanks, missiles...

And his original father and mother, his friends and classmates.

It felt like another lifetime. He could no longer even remember what he had looked like.

What had he done for a living? He couldn't remember.

Had he ever had a girlfriend? He couldn't remember.

What had his parents looked like? He couldn't remember that either.

"Who am I? Am I still me?"

In this world, his parents were dead, and few people truly cared about him. No matter how good Iruka-sensei was to him, Iruka had a life and a family of his own to think about.

Apart from Iruka, only Hinata cared about him.

But Hinata was too young. Naruto couldn't share his secrets with her, much less tell her about the pain and thoughts he kept inside.

"I'm alone."

A lonely fate.

But instead of silently enduring fate, couldn't he fight to change it?

After all, the Fate Choice System had brought him this far.

"Mangekyō... could you give me the power to break free of fate?"

His reflection came back into focus.

His eyes had become blood-red, with black eight-pointed stars in their pupils. They looked profoundly mysterious.

"Mangekyō!"

Naruto poured Chakra into his left eye. The black eight-pointed star spun rapidly, but nothing seemed to happen. No black flames. No assault on the mind.

"No. Something did change!"

The river's current and the fish swimming beneath its surface had slowed considerably!

"What does that mean? Has time slowed down for the whole world?"

Naruto raised his hand without thinking and found that it moved twice as fast as usual. He had barely put any force into it, yet it shot up as though he had flung it.

"I get it. Time sped up!"

Naruto's lips trembled as he murmured in excitement.

Time hadn't sped up for the whole world. It had sped up for him!

That made the world around him seem slower. In reality, both his movement and reaction speed had increased together!

His left Mangekyō eye's ability was clearly Time Acceleration. It accelerated Naruto's own time!

His body moved faster. He reacted faster. He formed Hand Seals faster!

That meant his Taijutsu had grown stronger, greatly making up for what had been a weakness.

And he could release Ninjutsu faster too!

The speed at which a Ninjutsu technique was released was crucial. Minato Namikaze's Flying Thunder God Technique had once made the entire Shinobi World tremble precisely because it required no Hand Seals and had no delay before activation.

So Naruto's overall strength had risen again!

The only concerns were what this might do to his lifespan and the loss of vision caused by frequent use of the Mangekyō Sharingan.

"If my left Mangekyō eye accelerates time, what does my right one do?"

Naruto deactivated his left Mangekyō eye and channeled Chakra into his right.

An identical black eight-pointed star appeared in his right eye and spun rapidly.

Somehow, he felt he knew the answer.

He pulled out a Kunai and slashed his left arm hard. Skin and muscle split, and blood immediately flowed from the wound.

But the next moment, the blood flowed back in, and the torn skin and muscle healed completely. It was as though the cut had been nothing more than Genjutsu.

"I knew it!"

An excited smile spread across Naruto's face.

This strange sight could only mean that his right Mangekyō eye's ability was Time Reversal!

Naruto used his Kunai to gouge a line in the ground. He waited, but the gouge remained.

"So Time Reversal can only affect me, just like Time Acceleration."

Having reached that conclusion, Naruto deactivated his right Mangekyō eye too. Then he could no longer hold back his laughter.

From now on, no matter how severe an injury was, as long as it wasn't instantly fatal or an attack on his mind or soul, he could recover completely. He only needed to be able to activate his right Mangekyō eye.

And with the Masterclass Physical Healing granted by the Uzumaki Clan Sage Body—the God-Tier Bloodline he already possessed—he practically had an immortal body!

Even the potential damage to his lifespan from using Time Acceleration was solved.

His left Mangekyō eye's Time Acceleration gave him formidable Taijutsu and Ninjutsu.

His right Mangekyō eye's Time Reversal made him nearly immortal.

"Is what my heart desires most really power?"

Naruto murmured to himself.

"Wait. There's more!"

Naruto suddenly realized that Time Reversal had one even greater benefit: it would let him activate the Eight Gates Released Formation without limit!

What would that look like one day?

"Night Naruto?"

"Infinite Night Naruto?"

"Haha!"

Naruto broke into a brilliant grin. This world was starting to look a lot more interesting.