Ishizu's POV
I lived in a rather normal apartment. It was in the Shinobi district, near the Hokage tower. I had 3 rooms. 1 living room, a kitchen, and a bed. Now here I am, thinking about how to make this plan go as smoothly as possible.
Even though I knew the massacre will happen, I forgot the exact time when. It was not like I knew everything and the time of this world.
The good thing was that I knew just the right person to stick to and so I stayed with Shisui Uchiha who was my teammate at some point during my Chunin years.
My relationship with Shisui was a good one. I was one, if not the only non-Uchiha, he had as a friend.
We both trained a lot during our early years and during that time I met Itachi. I also met Sasuke, but he was too young to interact with us adults.
A few days later:
I confronted Shisui earlier about the conflict of the Uchiha clan and the possibility of a civil war breaking out. I warned him not to trust Danzo as he had some kind of grudge against the Uchiha's and that if he went to Danzo, he would die.
It shocked Shisui at first as to how I knew about the clan's problems but dismiss it as he knew that I could have heard it when he was visiting him in the clan compound.
I saw Shisui getting nervous, not knowing what to do, but that nervousness was gone and instead a smile appears on his face.
"Now I know what I have to do and you, my friend, will help me," said Shisui as he put an arm around my shoulder.
What I didn't expect him to do next was to pull both eyes out of his sockets. I was experienced with blood and disgusting things, but seeing your friend taking both eyes out was not a good sight.
"Ishizu, I don't want to think that Danzo would do such a thing but what you say could be true. My Sharingan is too powerful to be in the hands of Danzo. "Kotoamutsukami" is the most powerful Genjutsu I have ever seen.
I thought I could trust Danzo, but him having my eyes would be a disaster for Konoha and you are one of my best friends aside Itachi.
I hope you can use those eyes to help Konoha.
I trust you so use them for something good. Please take care of Itachi and Sasuke for me.
They are family, as you are all but in blood," said Shisui before handing them to me.
I tried to talk him out of it saying he could use it now on the clan head, but Shisui waved his hand explaining.
"Ishizu, ROOT is everywhere and you know it. Even if I survive, I will be hunted by Danzo and can not come back to Konoha. Please protect Konoha, Itachi, and his little brother with everything you have."
To trick Danzo, Shisui transplanted some other Sharingan eyes and confronted Danzo.
I watched, secretly, as it happened and the meeting was mostly the same as in the anime.
Danzo got the "fake" eye, and when Shisui came to Itachi, I showed myself. "Ishizu-san why are you here?" asked a confused Itachi, seeing me l.
"Well, I want to say goodbye to Shisui," I explained the young prodigy.
Whispering to Itachi: "I hope you know what to do. Choosing between Clan and Village is a choice, not even I know how to take. Don't worry I will take care of your brother. I will help you get the eyes of your parents so Danzo can't take them. Take care."
I hugged Shisui and let a few tears down my eyes. He was and will be a good friend. One day I would make it up to him.
I couldn't watch him committing suicide or prevent it as it helped Itachi awakening his mangekyō.
This is what I hated the most. Even if I knew beforehand about the events, I couldn't change it.
That is why I needed power.
I needed to be the strongest so nothing could be taken away from me.
In this world, people who had power ruled. If I could become the strongest person, nobody would die and I would achieve peace.
(God complex is strong I know)
As I walked away, I could hear a faint 'thank you' muttered.
The days went by and Itachi and Obito killed the Uchiha clan except for Sasuke.
I acted during the time when Sasuke was put into the 'Tsukuyōmi' by Itachi.
It was not easy to avoid both Obito and the ROOT, who closed the compound. I even had to kill some of those emotionless Shinobi or they would raise the alarm.
In the main compound, I found Sasuke's parents lying on the floor. It was a miracle that ROOT wasn't here. I crouched down and took Fugake and Mikoto's eyes before Danzo could get them.
Moving out, I saw the motionless body of Sasuke lying on the floor. I knew there would be no better chance so I made my way to Sasuke.
He was out cold from the Genjutsu so he wouldn't notice it as I took a syringe and a scalpel out of my pocket and collected blood and cells from Sasuke.
(I hope you know what I want to do)
Still Ishizu's POV
After the massacre happened, I went home and sat on my chair in the living room which now looked more like an Orochimaru experiment room.
I knew from my past memories that to awaken the Rinnegan one needed both Indra's and Asura's chakra.
Madara got them by putting Hashirama cells (Asura's Chakra) inside him and awaken them but what nobody thought of was that all Uchiha's were descendants of Indra even when Sasuke was his reincarnation.
So I took Sasuke's blood and injected it in Shisui's mangekyō Sharingan's bloodstream that was in a special bottle containing liquid, helping prevent the eyes to rot.
This was Indra's chakra being transferred to a mature Sharingan.
I also, under strict guidance and good knowledge of Iryō Ninjutsu, made a wound around my left chest and transplanted some skin and blood of Naruto into it.
(Same as Madara did and Ishizu has blood group AB for you medical readers)
So now I had a mangekyō Sharingan of an Uchiha with Indra's chakra and my body containing Asura's.
I should have a body that could contain Sharingan eyes though I still wanted to implant myself with Hashirama cells just to be sure. Maybe it could contain the strongest Dōjutsu in the Elemental Nations.
My thoughts were interrupted as I saw the eyes changing but not into what I had hoped. To be honest I didn't expect to get any result as Madara needed years to awaken his Rinnegan.
What I got was a new Sharingan. A Sharingan I had seen in my old life and knew I was on the right track.
Ishizu's living room
As I looked at the small flasks where the Sharingans were stored I saw two Sharingan's looking back at me.
Both looked like they were a mixture of Sasuke's and Shisui's mangekyō; The first in vitro made eternal mangekyō Sharingan.
I was so happy that I stood up and laughed like a madman. After a while, I calmed and sat down.
I thought about it and theorized that Sasuke's blood, upon injecting into the eyes, mixed itself with the eyes of Shisui. This process also happens if you transplant Sharingan eyes between two persons.
Madara got his eternal mangekyō Sharingan when his brother gave it to him as the warlord started losing his sigh from overuse. It probably wouldn't work if Sasuke didn't awake his Sharingan during the massacre but I couldn't confirm that. It was just a theory.
Unfortunately, it would probably take some years to awaken the Rinnegan, but I knew I had to take the risk.
I couldn't wait till they changed or it would be all for the garbage can.
At that moment I didn't realize but the prophecy about the one who will bring peace changed to another more confusing prophecy.
Mount Myōbaku
Gamamaru the 'Toad Sage' sat on his chair with his eyes closed, smoking his famous pipe, when all of a sudden a vision appeared before him.
(Finally, a description of the MC)
A tall man with a muscular body having short blue hair appeared in the vision.
He had an oval face and his distinct feature was manly kin.
He had a serious expression on his face. His red eyes(not the Sharingan) had a fire burning in them but as Gamamaru looked further, he saw his eyes changed into ones he only saw once when he was young.
The Rinnegan, better know as Samsāra eyes.
The eyes of his old friend Hagoromo Otsutsuki. Gamamaru tried to look further to see what kind of person he was and was astonished.
He had a heart that could contain both light and darkness in a perfect portion.
Both Yin and Yang. Normally a person had more yang or yin but he was 50/50.
'Like a panda' he thought.
"This person, whoever he is, will definitely change the future. I need to tell Jiraiya about it.
A new prophecy had come. The man mastering both yin and yang will guide the Child of Prophecy, but I see greed in those eyes of his.
It is unknown if he will betray the child for his own purposes or fight the evil coming together," spoke the Toad Sage in a low voice before again starting to smoke his pipe.
Ishizu's experiment room:
I needed to transplant those eyes as fast as possible for a good reason.
Obito was an Uchiha and he could only transplant 1 Rinnegan eye. Nagato was an Uzumaki getting the eyes from Madara who, when summoned the Gedo Mazo, became a cripple.
I had injected myself with both Hashirama cells and Naruto's to stabilize the process of injection and so that they would later mix.
It was good to have learned medical Ninjutsu from Rin, god bless her soul and for Obito to choke on some wood.
I didn't waste my early age and got myself on some good cells after raiding one of Orochimaru's 'new bases'.
The fool didn't know who took them and probably still wonders who knew of his secret base.
My biggest fear and problem was that I was a non-Uchiha and just like Kakashi I had to cover my eyes or I would be drained of chakra to death.
Only I had to cover both my eyes and that made me eventually blind. I had hope because Naruto was only starting his 3rd academy year.
2 years before graduation so being blind and hoping that after that I had a bigger chakra pool to expand the time having both eyes open.
'Hmm, good idea.'
Of course, I didn't want to slack off and made a plan to constantly deplete my reserves until they are low and then recharging them.
It took 2 hours of Shadow Clones running around while I was awake during the whole process until it was done. Getting the memories of the Clones was not a good experience.
I put a special chakra band (one that protects people from seeing trough) on my eyes so no Hyūga could see them or some other bandaged patriotic person.
I told the Hokage beforehand anyway and came up with a lie that I wanted to increase my reserves.
He was first against it telling me that it was a stupid and wasteful idea but I told him I could remove them if I wanted as I kept my former eyes in a flask.
The downside was that I couldn't train Naruto anymore properly. He still visited me and we talked about the theory of some Justus and his life in the academy.
Naruto, being rational, quiet and didn't scream to each person 'believe it, I will be Hokage' made some friends.
He talked with Hinata and developed a crush on her. ( Instead of the banshee)
When I asked him why he didn't like Sakura he told me that he liked her hair but Hinata was sweet and friendly and Sakura tried to hit him when he wanted to talk to her as he disturbed her time with her precious Sasuke-kun.