What could be an interesting plot for a One Piece, Carrot, and Lemon crossover fanfiction?

Well, it could be a story where Luffy, Carrot, and Lemon go on an adventure to find a hidden treasure on a mysterious island. Luffy's determination, Carrot's agility, and Lemon's (assuming some unique ability here) would all contribute to their journey.

A fanfic could start with Luffy getting separated from his crew and landing on an island where he meets Carrot. They find a lemon tree that has the most peculiar lemons. These lemons seem to have a life of their own. As they explore the island further, they find out that the lemons are the key to an ancient treasure. However, a powerful enemy also knows about the lemons. Carrot and Luffy then have to use their unique skills. Luffy with his Gum - Gum powers and Carrot with her ability to transform, to outwit the enemy and find the treasure.

One idea could be that Carrot discovers a lemon - themed island that has a strange power. Maybe the lemons on this island can grant temporary super - speed, like her Sulong form. And the One Piece crew arrives there. Another could be a fanfic where Carrot has to solve a mystery involving a lemon - scented treasure map that leads to a part of the One Piece. Or perhaps a story where a lemon - loving villain tries to capture Carrot for some devious plan related to the secrets of the One Piece.

Well, maybe the Omnitrix gets damaged and its energy somehow mixes with a Devil Fruit. This creates a new situation where Ben has to deal with having powers from both the Omnitrix and the Devil Fruit. And the Straw Hats are intrigued by this new power source and try to help Ben control it while also facing threats from other pirates who want this power for themselves.

One possible plot could be Itachi arriving in the One Piece world and being mistaken for a powerful new pirate. The Straw Hats might initially be cautious but then realize his skills could be useful. Itachi, with his Sharingan, could help them in battles against the World Government or other strong enemies. For example, his genjutsu could be used to deceive opponents during sea battles.

One idea could be that the Straw Hats end up in the Naruto world. Luffy might befriend Naruto and they could team up to fight a common enemy like Akatsuki members who are after some powerful Devil Fruits that have mysteriously appeared in the Naruto world. Zoro could have duels with some of the skilled sword - users in the Naruto universe, like Sasuke or Killer Bee when he uses his sword - like Samehada.

Perhaps there's a powerful and mysterious treasure in the RWBY world that the Straw Hats hear about. It could be something related to the Dust or an ancient relic. They team up with the RWBY characters to search for it. Along the way, they encounter various villains from both universes who also want the treasure. Ruby's speed and Crescent Rose could be compared to Usopp's long - range attacks, and Blake's stealth could be useful in sneaking past enemies. The story could explore how the different powers and personalities interact during this adventure.

One possible plot could be that the Straw Hat crew sails to the world of Sekirei. Luffy might be intrigued by the concept of Sekirei battles and try to participate in a friendly way. Maybe Zoro would find some Sekirei with interesting sword - fighting skills and have duels with them. And Nami could be interested in the economic aspects of the Sekirei world, like how they trade resources or manage their finances.

In a crossover fanfiction, it could be that the power of Devil Fruits from One Piece becomes known in the Dragonball universe. Vegeta, being his prideful self, wants to obtain a Devil Fruit power to make himself even stronger. He travels to the One Piece world and accidentally ends up on the Thousand Sunny. The Straw Hat crew initially see him as a threat but then realize they can help each other. They end up in a big adventure together where they combine their powers to fight a new common enemy that threatens both universes.

Carrot would probably be very curious about the lemons. She might try to eat one at first, thinking it's just a normal lemon, but then discovers its special properties. The Straw Hat crew would be a bit amused by her antics. Luffy might even try to make a game out of the lemons, like seeing who can throw a lemon the farthest. And if there are any lemon - based characters, they would be initially wary of Carrot as she's a mink, but then they could form an alliance based on mutual goals.