One possible plot could be that Goku and his friends somehow end up in the One Piece world. They meet Luffy and his crew. Goku might be interested in the Devil Fruits and their powers. Luffy, on the other hand, would be excited to see Goku's super strength and ki abilities. They could team up to fight a common enemy like a powerful pirate who has also acquired some sort of dragon ball - like artifacts. This would lead to an epic adventure with both the Saiyans' and the Straw Hats' unique fighting styles combined.
Well, perhaps the Saiyans in Dragon Ball Z detect the strong energy from the Devil Fruits in One Piece. Vegeta decides to visit the One Piece world to see if he can gain an edge over Goku. Meanwhile, the Straw Hats are dealing with a new threat that seems to be more powerful than any they've faced before. Vegeta initially clashes with the Straw Hats but then realizes they need to work together. They combine their skills, like Goku's Kamehameha and Luffy's Gear Fourth, to take on the big bad.
One possible plot could be that Luffy and his crew are sailing in the Grand Line when they encounter a strange energy. It turns out to be a Dragon Ball. They then have to deal with various villains from both universes trying to get the ball. Maybe Frieza hears about it and teams up with some of the pirates from One Piece. And Goku, sensing the power of the Dragon Ball, also arrives in the One Piece world to help Luffy protect it.
There's also 'Dragon - Pirate Alliance'. This fanfiction delves deep into how the Z - Fighters and the Straw Hat Pirates would form an alliance. It explores the different cultures and fighting styles of the two groups. For example, how Vegeta's pride would interact with Zoro's sense of honor, and how Gohan's intelligence could be used in conjunction with Nami's strategic thinking.
It's likely Goku. His Super Saiyan forms give him incredible power levels that far exceed most of the characters in One Piece. He can move at incredible speeds, has amazing strength, and can fire powerful energy blasts. Even Luffy in his Gear Fifth form would probably have a hard time against Goku at his full power.
The new storylines that can be created. For example, a new villain could emerge that requires the combined efforts of both the One Piece and Dragon Ball Z crews to defeat. This could involve battles in different settings from both universes, like fighting on the Grand Line and also in the Hyperbolic Time Chamber. It gives a whole new perspective to the existing story arcs of both series.
Goku and Luffy would be really interesting. Goku is all about pure strength and the pursuit of becoming stronger through training, while Luffy is more about the adventure and his dreams. Their different outlooks could lead to some great conversations and also some funny moments, like when Luffy tries to eat Goku's senzu beans thinking they are some kind of food from his world. Another interesting interaction could be between Vegeta and Zoro. Vegeta is very proud and serious, and Zoro is a swordsman with his own code of honor. They could have some intense sparring sessions and also respect each other's strength.
Zoro and Vegeta would also be a cool pairing. Zoro is all about becoming the greatest swordsman and has a strong sense of pride. Vegeta is a proud Saiyan prince. They could start off as rivals, constantly trying to outdo each other in combat. But as they face tougher enemies together, they would start to respect each other's skills. Vegeta could teach Zoro some energy - based attacks to add to his swordsmanship, and Zoro could show Vegeta the value of discipline in a different way.
Sure. One popular 'One Piece Dragon Ball Z crossover fanfic' is 'The Saiyan Pirate'. It has an interesting plot where Goku somehow ends up in the One Piece world and teams up with Luffy to fight a new common enemy. Another one is 'Power of the Grand Line', which combines the unique powers from both universes in a really cool way.
The character interactions are really fascinating. Picture Vegeta trying to understand the laid - back attitude of the Straw Hats. Also, the concept of different types of power systems colliding. Ki from Dragon Ball Z and Haki from One Piece meeting in one story can lead to some really creative and exciting plot developments. It often makes for unique and unpredictable storylines that keep readers hooked.