There's not enough information to know exactly who Rayleigh is. It could be a common name for a person in this context, maybe a local storyteller or someone known within a particular community.
In fanfics, Admiral Kizaru's power can be highly exaggerated. His Pika Pika no Mi ability, which allows him to move at the speed of light, can be made even more potent. Writers might make him capable of creating stronger light - based attacks or having better control over his speed. For example, he could be shown to split into multiple light - clones more easily and use them in more complex battle strategies.
Another theme is loyalty. Kizaru is often part of a group, and fanfictions explore his loyalty to his comrades. There could be stories where he has to choose between following orders and doing what he believes is right for his friends. This creates interesting moral dilemmas within the story.
Well, 'rayleigh tells story' might refer to a situation where Rayleigh, who could be a storyteller, a character in a certain setting, or just an individual named Rayleigh, is in the act of narrating a story. Maybe it's a bedtime story for kids, or a spooky story around a campfire. Without more details, it's hard to say exactly.
One idea could be a crossover with the One Piece world and the Naruto universe. Kizaru could end up in Konoha and his light - based powers would be a mystery to the ninja there. They might mistake his abilities for some new form of ninjutsu.
Fanfic writers often play with Admiral Kizaru's power in unique ways. They might give him the ability to manipulate light in different forms, such as creating solid light constructs. These constructs could be used as shields or additional weapons. Also, his power over light could be extended to include the power of illusion, where he can create false images of himself to confuse his enemies. This adds a new layer of complexity to his character and his battles.
Well, in this fanfiction, perhaps the relationship between Luffy and Rayleigh is explored in more depth. We might see Rayleigh sharing his old tales of the Pirate King Gol D. Roger with Luffy. This could inspire Luffy even more in his journey to become the Pirate King. Also, Luffy's character growth in terms of leadership could be a great part. Under Rayleigh's guidance, he might learn how to better lead his crew and make more strategic decisions during battles.
First, decide on the world or character you want to crossover with Kizaru. For example, if it's the Star Wars universe, think about how Kizaru's light - based attacks could be compared to lightsabers. Then, come up with a plot. Maybe Kizaru is sent to a different galaxy and has to find his way back home while getting involved in the Galactic Civil War.
There's a fanfiction called 'Kizaru and the Lost Treasure'. Here, Kizaru stumbles upon a map that leads to a long - lost treasure. Along the way, he has to face off against other pirates who also want the treasure. His speed and light abilities give him an edge in the battles that ensue.
Probably, the main plot is about Luffy's transformation under Rayleigh's training. Rayleigh could be teaching Luffy about the secrets of the Grand Line, the lost history, and advanced combat skills. Luffy then uses what he has learned to face new and more powerful enemies. For instance, he might encounter some strong pirates who are also after the One Piece, and he has to use his newly acquired skills to defeat them and protect his crew. The plot could also involve Luffy's crewmates waiting for him during his training and their own mini - adventures in the meantime.