Goku would probably be very friendly with Luffy. They both love to fight strong opponents and have a sense of adventure. Goku might be a bit confused by some of the wacky things in the One Piece world like the Devil Fruits at first, but he'd quickly adapt. He'd also likely be impressed by the determination of the other characters like Zoro and Sanji.
Well, a Goku - One Piece crossover fanfiction might involve Goku getting lost in the One Piece universe. He could end up on a random island and befriend Luffy and his crew. Goku would probably be interested in the different Devil Fruits and might even try to use his powers to help them find the One Piece. His fighting skills would also be a great asset during battles against the likes of the Yonko or the World Government's forces.
The unique aspect is that it combines the familiar characters of One Piece with the concept of reaction. It's fun to see how characters like Luffy or Zoro would react to things they might not have known before, like modern technology or different interpretations of their own stories.
Definitely the potential for epic battles. Picture Goku going up against the Four Emperors all at once. His speed and strength could turn the tides in a battle that the One Piece world has never seen before. Also, his friendship with Luffy could lead to some really heartwarming moments. They both share a love for adventure and fighting strong opponents. And Goku's ability to sense energy could be a game - changer in a world where most rely on observation Haki. It could open up new ways of detecting threats and finding hidden things in the One Piece universe.
One interesting crossover could be Goku arriving in the One Piece world and teaming up with Luffy to fight a powerful enemy. Goku's incredible strength and combat skills combined with Luffy's Devil Fruit powers would make for an epic battle. Another could be Goku teaching the Straw Hats some of his martial arts techniques, which would enhance their fighting abilities in their own adventures.
Goku Black could be a powerful new threat. His ability to instantaneously move between spaces using his powers would be like a more advanced form of the Shanks' ability to appear suddenly. He could easily target the weak points of the various islands in the One Piece world.
One possible scenario could be Goku Black using his power to take over a part of the One Piece world. He might try to find the One Piece itself, thinking it could grant him even more power. His dark nature would likely put him at odds with the Straw Hat crew, leading to epic battles.
Some would be excited. Luffy would probably be eager to jump into the future he sees in the fanfiction. He's always looking forward to adventures, and if the future seems cool, he'd be all for it.
Sure. 'One Piece: The Straw Hats React to Their Future' is a great one. It shows how the Straw Hat crew reacts to seeing possible future events of their adventures, which is really interesting.
They may laugh out loud if there are humorous parts in the fanfic. For instance, if the fanfic writer creates a comical situation involving the characters that is well - written.