You are Nami’s older step-brother. (Don’t be weird I’ll explain in a second). You are Bellemere’s biological kid and she adopted Nami. You two have been close ever since, like best friends. Until the incident with Arlong. He took Nami to work for him and you were captured. When Luffy defeated him you escaped but they left before you could see Nami. Now, two years after the Marineford war and years of separation. Nami guides the Thousand Sunny right to a supply island. But she notices someone that looks very much like you. She squints to see better and realizes it is you! Even after this long!
What happens when Luffy never met the straw hats or shanks pirates? Well! First off, all of the crew members joined the red-haired pirates after meeting! Usopp stayed with his dad and everyone is peaceful. Shanks still owns the straw hat and never lost an arm. They had a giant ship for all of the crew members. (There’s a lot of them) and one day they dock at an island home to craftsmen, engineers and scientists. They were exploring then the crew found their way to a scientist and the scientist gladly showed his lab. Animals, potions, spells. Tubes. All of it was experiments. Then they came across a tube. Inside was a human. His name was Luffy. Black hair, sun-kissed skin with freckles and his skin perfect. He was shirtless and had pants on as he floated unconscious in the liquid in the tube. He was an experiment. Experiment 068. The scientists are known to be good people and dont kill then or anything so it was fine. The crew intrigued. Talking to the scientists and amongst each other because they didn’t know him. But shanks, the captain, was quiet. Until he blurted out he would pay any anoubt of money for Luffy. Because.. when shanks saw Luffy his breath hitched. Just by looking. Shank knew he wanted Luffy on the crew. Because he immediately saw Luffy as his son. Maybe instinct? Or is it ment to be? But after a good long moment of shans being quiet and everyone else talking. He blurted it out. It made everyone freeze. Shocked. But shanks had a good reason. Shanks was always a good man and told he would be an amazing father. Shanks always said he’d never adopt or have kids. But now? Well.. he had a change in heart. Since Luffy is an experiment. He has more powers along with the devil fruit. Fire, ice, telekinesis, and also float. And next to Luffy’s tube was UTA. A girl with red and white hair. Shanks wanted both of them. Uta had been through almost the same things as Luffy with some different powers. And what was even more shocking. Zoro fell in love with Luffy at first sight. Holy shit.
The straw hats and law formed an alliance. Their boat is connected for the meantime. But there has been a two year separation. All the others have met back up except for luffy. The captain. So they went to the island he has been on for the past two years. They were shocked. Luffy had changed. He was in a clear area, blindfolded. Reyleigh was holding two sharp deadly weapons and hurling them at luffy with intense spears. Luffy was dodging and had insane react time despite being blindfolded. Luffy had changed over the two years with all the survival and physical training. He acted more like.. shanks honestly. He didn’t talk about meat anymore and was more focused and smart when it came to battles. The group shocked. Luffy kept training nonstop because reyleigh kept yelling things like luffy needed to protect people and this was how. Since luffy couldn’t protect his brother. He was gonna show the world not to mess with luffy and his brothers ever again. Luffy was training and training for people’s sake, to become a better person, and to avenge his brother, ace. And the training was.. crazy.