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.
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 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.
Obviously, Luffy himself is the central character. But other characters like Nami often play important roles. In Smart Luffy fanfiction, Nami could be the one who helps Luffy understand complex concepts related to navigation or money management. Since Luffy is smart now, they might have more in - depth discussions about how to use their resources on the Grand Line.
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.
One interesting Smart Luffy fanfiction could be where Luffy uses his new - found intelligence to outwit powerful enemies in a strategic way. For example, instead of just charging into battle, he devises elaborate plans that take into account the enemy's weaknesses.
The contrast it creates. Usually, Luffy is seen as a bit of a goofball, so when fanfiction makes him smart, it's a fresh take.
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.
It's popular because it shows a different side of their relationship. People like to see Luffy being more than just his usual carefree self and using his smarts in relation to Nami. It adds depth to their dynamic.
Another idea is that in the fanfiction, Luffy's intelligence is related to his ability to understand ancient languages or prophecies. This could lead him on a new adventure to uncover hidden secrets in the One Piece world, like the true meaning behind the poneglyphs. He could then use this knowledge to get closer to the One Piece.
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.