"So, we all know the ongoing story(thank God I still have material to work with) of Monkey D. Luffy, the future Pirate King, right? And we all know about his dead brother, Portgas D. Ace also, right? Well, here's the thing: Ace's death has always bothered me, one way or another. And I know I'm not the only one who agrees with the donut's death. I always felt like there could be more to his character, instead of him just dying that easy. Like to a literal "Yo Daddy's Joke". I mean the dude had a powerful Logia-Type Devil Fruit, Conqueror's Haki, even stated to have awakened Armament, the potential to learn all three forms of Haki and awaken his Devil Fruit, yet decided to die like that. I mean, come on, Luffy learned basic Haki in two years, then proceeded to not only unlock all their advanced forms but also awaken his Devil Fruit.
But then I realized, I can just make my own what-if. What if instead of Ace being the son of the former Pirate King, Luffy was truly the one who inherited that mantle instead? This is the story of Gol D. Luffy(my version since Manu from YouTube made his own what if video, go check it out if you want, but this is still my own take)."
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Note: I'm not a great writer, compared to people who write peak fiction like Eichiro Oda and some other WebNovel writers. Can't guarantee this is going to be a good read but hey, if it made you enjoyed it then I tried my best.