One common theme is the clash of different worlds. Since it's a crossover, Majima is often thrown into a world that's very different from his own, and the story explores how he copes with the new rules, cultures, and powers. For example, if he crosses into a magical world, he has to figure out how magic works.
One great piece of goro majima crossover fanfiction is 'Majima in Another World'. It combines his unique character traits with a new and exciting fictional setting. The story is full of action and the author does a great job of keeping Majima's personality intact while exploring new scenarios.
Well, it could be about an OC who uses the powers of the Goro Goro no Mi in a world full of pirates. Maybe they use the lightning - based powers to fight against other powerful foes, like the Marines or other pirates. They might also use it to explore uncharted islands that are filled with dangerous creatures and hidden treasures.
Naruto himself is often a popular character in such fanfiction. Writers might explore how he would adapt to having the Goro Goro no Mi power, or how he would interact with someone who has it.
One interesting concept could be how the Goro Goro no Mi power is used in unique battle scenarios. For example, the user of this Devil Fruit power might combine it with Naruto's signature jutsu in creative ways to defeat powerful enemies.
It could be a new character who has a deep understanding of the Goro Goro no Mi's powers and wants to use Luffy's new - found abilities for their own evil purposes. This character might be a scientist who has studied Devil Fruits extensively and sees Luffy as a prime specimen to experiment on.
Another plot idea could involve Luffy meeting someone who also has a connection to the Goro Goro no Mi. Maybe it's a long - lost relative of Enel who has a different view on how to use the powers. This could lead to a conflict or an alliance depending on how the story unfolds.
The Goro Goro no Mi could make the OC's personality more electric, in a sense. They might be more energetic and vibrant, always on the go. Since electricity can be both a destructive and a life - giving force, they could have a complex personality. They might be kind - hearted but also have a fierce side when it comes to protecting the weak. They could also be a bit of a show - off, using their powers to impress others. For example, they might create lightning shows in the sky just for fun or to gain attention.
The Goro Goro no Mi is a very powerful fruit in the One Piece world. If an OC had it, they could potentially have the power to fly by riding on a bolt of lightning. They could also create electric shields to protect themselves from attacks. Another ability could be to send out electric waves to disrupt the electronics (if there were any in the One Piece world) or to stun opponents. Plus, they could use the electricity to heal themselves in a way, by using the energy to stimulate their body's cells, although this would be a more advanced and less - known use of the power.
One idea could be a character who has eaten the Goro Goro no Mi and uses its electric powers in unique ways during battles in the Naruto universe. For example, they could combine it with ninjutsu to create new and powerful attacks.