First, you need to define how Luffy becomes smart. Is it through a special event, like eating a new type of Devil Fruit? Or maybe he gets a sudden inspiration. Then, think about how this new intelligence will change his relationships with his crewmates. For example, will he start giving more strategic advice to Nami during their adventures.
To start a Luffy crossover fanfiction, you should first study the two universes you're combining. Let's say it's a Luffy and Attack on Titan crossover. Know the key elements of both worlds, like the Titans in Attack on Titan and the Devil Fruits in One Piece. Then, create a conflict that involves both Luffy and the characters from Attack on Titan. It could be that a new type of Titan has the power to nullify Devil Fruits, and Luffy has to find a way to stop it. Write a rough draft of the first few chapters, focusing on introducing the crossover concept clearly.
Well, start with a 'what if' question. What if Danny was suddenly transported to a parallel universe where ghosts are the dominant species and they value intelligence above all else? Then, create a plot around this idea. Decide on the main conflict, like Danny having to prove his worth to the intelligent ghost society. Develop your characters, especially Danny, making sure to show his growth and how he adapts to this new situation. And don't forget to add some action and drama to keep the readers interested.
First, you should have a clear idea of the plot. Decide if it's going to be an adventure in a new island, a battle against a powerful enemy, or something else. Then, think about the characters. You can focus on Luffy's character development, like how he'll grow in this fanfic. For example, you could start with a simple situation, like Luffy smelling some delicious food on an unknown island.
First, think about the relationship between Luffy and Sanji. Consider their personalities - Luffy's carefree and food - loving nature, and Sanji's chivalry and passion for cooking. Then, come up with a simple plot idea, like a new adventure they go on together.
You can start by creating a character arc for Bart. Show how his life changes from being the class troublemaker to the smartest kid. You could also introduce new characters that are either inspired by his new intelligence or are jealous of it. For instance, a new student who challenges Bart's new - found intelligence in a battle of wits.
Their relationship might become more of an equal partnership in terms of strategizing. Usually, Luffy is more about action, but a smart Luffy could contribute intellectually to Robin's plans, making their bond stronger as they rely on each other's skills more evenly.
To start a Monkey D. Luffy crossover fanfiction, first determine the other franchise. Let's take a crossover with the My Hero Academia world. Start with an event that brings the two worlds together, like a villain from the My Hero Academia world using a quirk that accidentally opens a portal to the One Piece world. Then, introduce the characters to each other. Luffy would be very interested in the different quirks and might try to imitate them in his own silly way. Midoriya, on the other hand, would be in awe of Luffy's strength and determination.
I'm not sure of a specific 'luffy is actually smart fanfiction' to recommend off the top of my head. You could try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net.
First, you should study Leon's character. Know his personality traits like his courage, his loyalty. Then, think of an interesting scenario for him. It could be a new mission or a different take on an existing event in the game. After that, start writing, describe his actions and his thoughts clearly.
Well, if you want to start writing rhink fanfiction, you should immerse yourself in the 'Rhink' world. This means studying their characters, their backgrounds, and any related stories. After that, come up with a unique concept. Maybe it's a 'what - if' scenario, like what if they met in a different time or place? Once you have your concept, create some characters (if needed) and start building the story around it. Write down your ideas as they come, and don't be afraid to be creative. You can also read other rhink fanfictions to get some inspiration, but make sure to add your own twist to it.