'Three decades of extreme training, study, and introspection and I finally did it. Mastering and meshing muay tai, kick boxing, kung fu, jujitsu, sambo, and karate to make my own own style was a pain in the ass but totally worth it. I finally beat the last of earth's best martial artists and became so strong no one dares to challenge me anymore'. Diesel thought.
"But what do I do now, my body refuses to improve no matter what I try. It's been 3 years since I got stronger or faster at all" muttered Diesel. 'keep moving forward I'll figure it out I'm not done here. I will get stronger'
2 years later
"WHY!?!?!?! WHY DO I STAY THE SAME NO MATTER HOW I CHANGE MY TRAINING!?" After 2 years of not being able to improve at all despair had slowly been consuming Diesel. He began to feel as if he was being chained with invisible shackles he just wasn't capable of breaking. Earlier at the end of his training he felt the chains again and spent the rest of the day fighting against these semi metaphorical chains but was unable to break them.
"FUUUCK YOUUUUUU!!!!!!!!!" In a fit of despair filled rage he screamed at the sky wondering what to do next. However during this time he heard a small "ting" and before he could figure out what it was he heard a voice say "how interesting" before the world went dark.
Diesel came to in front of a fire in what he could swear was a old one room log cabin. After remembering that random voice before everything went dark he starting looking around and found a rather normal looking guy carving a small piece of wood in a rocking chair looking at him curiously.
Before Diesel could speak the guy said "You're an impressive guy to actually create a crack on the Chains of Mortality. In essence for a single moment your will overpowered the earth's will.The martial art style you made is arguably an even harder feat to achieve considering it's THE best I've ever seen created by someone who isn't divine, and it suits you perfectly."
"Letting you rot here would be a waste so in recognition of your achievements I shall grant you 3 wishes. Oh and before you ask I'm what you would call a higher power or perhaps a divine being so just ask away. I can put you somewhere without all the earth's limitations so you can get even stronger."
Now most people would be speechless at this point and be confused them happy something like this happened to them. Diesel though just felt endless gratitude after hearing he could start growing again and thanked the mysterious man from the bottom of his heart.
The despair faded from existence and a blazing lust for battle could be felt around the whole cabin as Diesel thought on what his wishes should be. Oddly enough it didn't take but a minute to decide. "Senior can you reincarnate me into one piece with all my memories intact?"
"Of course thats easily done I take it you want to start over from scratch physically then? You can start training as a toddler and grow over time that way."
Diesel was pumped as one piece was his favorite anime and if he can get what he wants next itll really put the cherry on top.
"Senior as for my second wish can you take the powers of the Ghost Rider and turn it into a devil fruit?" Ghost rider had always been my favorite hero not to mention evil is everywhere in one piece and it's the perfect skill set for punishing those who get in my way.
"Hmmm yeah I can do that I guess it would be the mythical zoan human human fruit model ghost rider. I'll also make it so sunlight doesn't affect you and the hell fire can keep the sea from touching you in a pinch to since it can burn underwater. And the third wish?"
"Senior for my final wish can you give me a body full of potential like Whitebeard and Oden? And please.... whatever you do make me normally proportioned not someone with tiny chicken legs."
"Ha! Some of them do look rather retarded dont they? Yeah we can do that and you'll be able to use all the different kinds of haki you just have to unlock them first."
Diesel was almost moved to tears by how this senior had saved him from himself and couldn't put into words how grateful he was. So he did something he had never done before and bowed at the waist to show his gratitude. "Senior I truly cant thank you enough."
"Bah its nothing really. After all if you still go forward like before constantly pushing and surpassing your limits then one piece will be just the start of your journey. Alright I'll send you on your way now maybe if you grow strong enough we'll meet again" the man smirked and pointed at diesel.
Then everything was dark again.