1 Luke(80 years old)-Luffy(5 years old)

Luke Hernadez was a 80 years old retired marine who has served his country during war times. He started as a Navy soldier because of his interest towards ships, duty to his beloved country and his love for the seas.

But later he was transfer into the navy seal due to his intellect and his learning capabilities. He had done various advanced training program and was considered a great asset to the marine.

He completed many missions throughout his service, including assassination, espionage, rescuing and many more. He had retired at the age of 65 with the rank of Admiral and had been enjoying his life watching various anime, tv shows movies and reading manga, comics and novels.

He had just finish reading the latest chapter of One Piece his favorite manga when his eyes closed and never be open again. He died of old age while he lived his life to the fullest. Hearing the winds through his ears he opened his eyes to see monkeys looking at him.

He found his self in a jungle, feeling light headed, he felt strange like everything seems taller. He freaks out when he saw his little hands but being a veteran soldier he quickly calm down and assess the situation he was in. He is alive-check, his hand were small-check?.

He quickly approached a puddle of water and looked at his reflection. He found himself looking at an oddly familiar face. He knows it's not his face then it suddenly hit him like lightning that the face he saw was the protagonist of One Piece Monkey D. Luffy his favorite character.

Accepting the situation that he was in he sat down in the middle of the jungle to think what he would do. He knows the possible future that he will facing and he knows he need to be ready to it. He assimilate the all memories of this body as his own.

He has a lot of knowledge and experience through his years in the marine but due to his body know he need to start from the start. That is why he decided that he is going to train his body to the limit.

He remembers that his grandpa left him here to train saying it will make him a great marine in the future. He started with simple 100 push ups, 100 sit ups and 5km run around the jungle while trying not to hit any obstacle.

After completing this he became hungry and hunted rabbits to sustain his lost energy and after eating he will sleeps and after recovering he will train again. Luffy after his first sleep the two soul inside him merger and in turns his personality merge being joyful and the same time takes thing seriously.

Luffy continued this routine for one week before he got out of the forest to find his Grandpa Garp waiting for him.

"Bwahahahaha you came out very quickly Luffy without serious injuries, that's my grandson who will become a marine hero one day bwahaahahaha" said Garp

Luffy being smart choose not to reply to his grandpa's shenigans and went along with it, he knew that he yelled back that he was going to be the Pirate King he will just taste his grandpa's 'Fist of Love'.

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

"Okay Gramps I'm coming and I also want Meat, a lot of Meat I am Hungry" said a drooling Luffy

For the next three weeks on the marine ship aside from training, eating, sleeping, Luffy started exploring the ship and was observing the ship's technology and its design. He toured all the rooms on the ship, quickly mentally noting all the things which could be useful in his future journey and future ship but only available only for the marines.

He tried asking his grampa about the things he found but Garp being Garp only want to eat his donuts and rice crackers pointed his right hand man to answers Luffy's question. Luffy also paid attention and watch carefully the cadets learning the Rokushiki techniques and analysed the training methods.

After another 3 weeks of constant watching he had already found all the secret and some flaws of the Rokushiki and even theorized the Rokuogan technique. During those 3 weeks Garp also furrther up the 'training' of Luffy.

Garp drops him into an endless ravine, tying him up with hundreds of balloons and letting him fly up and letting him fight various animals in the jungle. Even though his grandfather's methods of training a 5 year old kid were outright murderous.

Luffy had to admit that he was growing stronger with each session of his survival training and was effectively improving his combat power, combat experience and his ability to survive harsh environment.

Luffy was with Garp for 1 whole year travelling the seas. Once he turned 6 he and his grandfather went to Foosha village for him to only be left to the mayor Wood Slap and the villages' bar tender MAkino.

Over the next year he continue to secretly train in the forest and took this chance to learn from Makino the social skills, like manners that were common in the One Piece world. It was a mixture of eastern and western culture of his old world but he learned all of it very fast thus he was given a title of being a genius by the villagers.

Luffy's training now consist of 1000 push up, 1000 pull up, 1000 sit up and 10 km running. He also constantly hunted animals in the forest or fishing to have higher nutrition intake to maintain his energy consumption while training. He also drinks a lot of milk from the cows to gain height.

Finally when Luffy was 7 years old he has already with a height of ordinary 9 years old his body is already toned and you only will see it if his naked. Just as expected Shanks and his crew had come to Fooshi Village.

Luffy became friend with the entire crew from the start and he liked them due to their not care attitude in life. But when the mountain bandit Higuma came down to Makino's bar to buy sake and humiliate Shanks, Luffy was very angry that he accidentally let out a Haoshoku Haki not enough to knock out the bandits but enough to be feel by Shanks and some of his stronger crew.

He knew that he won't stoop to the level of the bandit to fight because that fight it's not worth fighting for he was still very upset that while they were attracted to Higuma and Shanks, Luffy took the chance to eat the Gomu Gomu no Mi. The taste was so disgusting but he still eat the fruit.

When the group of bandits left already Shanks attention came to Luffy who just sits in the corner munching something and saw the fruit he was eating.

"Oi Anchor what are you eating?" asked Shanks. After Shanks asked this all the crew now pays attention to Luffy.

"Eh? Me? I eating your dessert. It's disgusting though" said Luffy while making funny faces.

"Eh!!! You mean the one that was in the box I brought?, did you really eat the fruit in the box Luffy?!" asked Shanks angrily

"Yeah?" replied Luffy trying to sound dump and uncertain.

"Spit it out! Quick!! Spit it out Luffy!!" said Shanks while lifting him upside down.

But by this time the fruit had already taken its effect and his legs stretched almost causing his face to hit the floor only to stopped it by doing a handstand. All of the sudden a silence permeated inside the bar only to be break by Shanks frantic shouting.

"Do you know what you did? You ate a Devil fruit and it's looks like you are made of rubber now and because of that you will never be can swim again in your life." shouted Shanks.

Luffy gave an exaggerated cry to fake his reaction. The next day he waited for Higuma to come down the mountain, he waited till noon and then proceeded his first kill of his identy as Luffy. He later asks Makino to get the bounty of Higuna telling a lie that he just found out that Higuma was ther at the ground.

Luffy keep the bounty he got hidden for future. Just like in the canon Shanks gave him the straw hat because he had unconsciously released some Haoshoku Haki and his speech about being a pirate, about gathering a crew stronger than Shanks and being the Pirate King.

Luffy still got the straw hat and Shanks did not have to lose his arm to save Luffy. This gave Luffy hope that as long he was strong enough he could change the future enough to avoid major tragedies in Luffy's life.