Chapter 1

Mark was a 50 old middle-aged man with blood cancer and without any living relatives or family. He started as a Navy soldier due to his immense interest in ships, love for his country and the oceans. But he was later drafted into special forces after 3 years of work at the Navy. This was because he had the intellect of an average scientist but also was an excellent learner for practical skills. He had done very advanced training and was considered a great asset to the country. He carried out many missions throughout his life, including assassination, ambushes, espionage etc. He had retired just two years back at the age of 48 and had been enjoying his life watching animes, tv shows, manga and comics, movies etc catching up to the rest of the world. The fact that he was constantly working and the nature of his work meant that he had almost nil personal life other than his colleagues and thus didn't have any lover or wife. He didn't know why but suddenly he had a huge pain in his left hand and felt a sharp pain in his heart. Thus he had passed away due to a heart attack.

Slowly he opened his eyes to find himself in a jungle. What was weirder that he was feeling strange interacting with his body like he was all of a sudden drained of all of his power. He looked around to search for any clues for where he was but couldn't find any.

He looked towards himself searching for the reason he was feeling weak. Even though he had retired from the Navy Special Forces recently he still kept himself in shape. He was shocked to see that it was the body of a child. He wanted to see the face but there were no mirrors in the jungle so he searched for a water puddle, lake or stream nearby. After some time he found and approached a puddle and looked for his reflection he was shocked to find a different face.

This was not his face but oddly enough it felt very familiar to him. Suddenly countless memories came into his mind and hit him like a ton of bricks and he passed out. During the time he passed out the merging of the two souls of Luffy and Mark his brain was getting rewired in the literal sense due to the overload of memories and to keep up with the information speed, his brain was becoming faster and information was being stored much easier. When he woke up after some time he got memories from the previous body's owner. He was shocked to know that the body was of Monkey D. Luffy from one piece. After consolidating memories from both lives and accepting the fact that he was reincarnated he found out that he had perfect recall, he could remember and recall all information from both his identities. Even little things like the phone number of a barbershop he went once as a kid.

But he found out this was as much a curse as it was a blessing as he could never forget his previous life and he was able to remember all the people he killed and watched them die vividly. It would have been mentally scarring for any other person except for him because even though he took orders from the government, because of his exceptional skills, they granted him privileges for choosing his missions and he chose only people doing the most heinous crimes.

It was also at that moment when he realized even though he would never be able to forget his old life, he could still carry on with his new life and identity as Monkey D. Luffy to whom he was pretty similar to in character except for his newfound intelligence and knowledge. It also helped that he was an incredible fan of the show and Luffy was one of his favourite characters.

It was also because of this and his possible future knowledge that he decided to work hard on training to avoid the tragedy that would have come his way in the future. Thus using his combat skills refined through years of combat and stealth skills from his assassination missions he decided he was going to train his body.

Afterwards, while hunting he found out the beast meat in this world contained some sort of energy, he could feel this because he could compare the feeling of digestion from his previous world, which he found out was helping him increase the efficiency of his efforts in body training. He also found out that his senses were also becoming stronger with the training. After 1 week of constant training, he got out of the forest and immediately his new Grampa came to where he was.

"Bwahahahaha, you came out very quickly Luffy, that is my Grandson you will become a fine marine one day," said Garp.

Luffy chose to not comment on his grandfather's shenanigans and went along with it, He knew that his old world's Navy and this world's Marines were on different spectrums and he didn't like this worlds marine one bit and knew that there was only one road that was being the Pirate King. But he would not be stupid enough to say it in front of his Grandfather only to get hit by his fist of love.

"Come let's go back to the ship we are moving from this island," said Garp

"Yes, Gramps I am coming and also I am Hungry, I want meat," said Luffy as he boarded his gramps marine warship.

For the next few weeks on the marine ship aside from eating and sleeping, he started exploring the ship and was observing the ship's technology and construction. He toured all the places on the ship, and noted all the things which could be used in his future journey and ship, but not available to people other than marines.

He also paid deep attention to the cadets learning the Rokushiki techniques and analysed the training methods and feasibility. After 3 weeks he had already found the secret to all Rokushiki techniques and he even theorized the Rokuogan technique.

But this was all in his mind and he needed to practice to learn it. He secretly tried it and was able to do all of the techniques once before he lost all his energy and fainted. The reason he was able to do them was his incredibly fine-tuned combat senses from his previous life and the new superhuman muscles in this world.

During these 3 weeks, he had also been further put into 'Training' by his grandfather like dropping him into an endless ravine, tieing him up with balloons and flying him away. Even though his grandfather's methods were outright murderous Luffy had to admit that he was growing stronger with each passing moment of his survival training and was effectively improving his ability to survive in harsh environments and combatting fears from his old life.

This was his 6th birthday and his grandfather had just left him at Foosha village with Makino and left because of a call from Marine HQ. Over the next year, he took this chance to learn from Makino social skills like manners and alike which were common to one piece world. It was like a mixture of different cultures of Japanese and western. But he learnt all of it very fastly thus he was given the title of a genius child by the people of the village.

He also snuck into the forest and started working at Rokushiki techniques and to maintain the training he constantly hunted in the forest for animals with higher energy to have higher nutrition to maintain his training and it paid off. Even though he still mostly looked the same from the outside his body had become extremely toned and he had increased his height somewhat.

Finally when he was 7 years old, and as expected Shanks and his crew had come to visit Foosha Village. He had made friends with the crew and liked them due to their not care attitude in life.

Thus when the mountain bandit Higuma came down to Makino's bar and humiliated Shanks, Luffy was very angry even though he knew that the bandit was below Shanks level and thus shanks didn't feel the need to attack unless life-threating, he still felt angry on behalf of them. But seeing all of them were attracted to Higuma and Shanks, Luffy took the chance and ate the gomu gomu no mi present in a chest on the table. The taste was disgusting but he ate the whole fruit. It helped that there were no seeds in it so he could large bites without waiting for removing the seeds.

When Shanks finally looked back to Luffy after Higuma went out he saw him eat the last piece of fruit.

"Eh, Luffy what are you eating?" asked Shanks

"Me? I ate this disgusting fruit you brought" said Luffy

"Eh!!! You mean the one was in that box?, did you eat the fruit in the box Luffy" said Shanks frantically

"Yeah "replied Luffy trying to sound uncertain

"Spit it out! Spit it out Luffy!" said Shanks lifting him upside down to make him spit out.

But by this time the fruit had already taken an effect and his legs stretched almost causing him to hit his face on the ground but he stopped it by doing a handstand. All of sudden there was a silence before shanks started shouting

"Do you know what you did? You ate the gomu gomu no mi which is a devil fruit now you have become a rubber human but you can never swim again in your life." Shouted Shanks complaining and explaining at the same time.

Luffy gave an exaggerated cry of surprise to fake his reaction of knowing it was a devil fruit. The next day he saw Higuma was harassing the townspeople in the towns square and he waited till they went away from the town and then proceeded to get the first human kill of his identity of Luffy.

Later there was news that his grandpa would be visiting the day after tomorrow, so he kept Higuma's body in a cold cave in the northern mountains on the island so he could get the 8 million Beri bounty on his head. The effect of the news that his gramps was coming made Shanks and red hair pirates started to set off.

Just like in the canon Shanks gave him the straw hat because he had unconsciously released some Haoshoku when the remaining bandits attacked the village on the day red hair pirates were leaving.

Thus he still got the Straw Hat and Shanks did not have to sacrifice his arm to save him. This gave Luffy hope that as long he was strong enough he could change the timeline enough to avoid major tragedies for Luffy's life. Because even though maybe Oda had planned the tragedies for Luffy's character progression, with him here those 'Character Devlopment plots' were unneeded for Luffy.