A great JJBA x MLP fanfiction idea is one where the concept of the Joestar bloodline is intertwined with the royalty in MLP. A pony from the royal family discovers that they have a connection to the Joestar family, and this connection unlocks hidden powers within them. This power could be a combination of pony magic and Stand - like abilities, and they must use it to save both their world and somehow, in a strange way, the world of JJBA that is mysteriously linked to Equestria.
One interesting JJBA x MLP fanfiction could be where the Stand abilities from JJBA are introduced into the world of MLP. For example, a pony might gain a Stand that gives it unique powers, like the ability to control time in a small area, similar to DIO's The World. This could lead to all sorts of adventures and challenges within the pony world as they figure out how to use these new powers and face off against villains who also might get their hands on Stand - like abilities.
There could be a fanfiction where the characters from JJBA are transported into the Equestria of MLP. Imagine Jotaro Kujo trying to adapt to a world full of colorful ponies and magic. He might initially be confused but then use his combat skills and Star Platinum to protect the ponies from threats that their normal magic can't handle, like some new dark force that is immune to regular spells but can be beaten with physical force and Stand powers.
One interesting JJBA gamer fanfiction could be about a gamer who gets transported into the JJBA universe and has to use their gaming skills to survive the Stand battles. For example, they might be really good at strategic planning in games, and they apply that to outwit enemies with Stands.
First, you need to decide on the main concept. Are you going to focus on bringing JJBA characters into MLP's world or vice versa? Or maybe you want to create a completely new world that combines elements of both. Then, think about how the unique aspects of each franchise will interact. For example, how will Stands work in a world full of magic like MLP? After that, start creating your characters. If you're bringing in JJBA characters, how will they look and act in the MLP universe? Sketch out a basic plot, like what the main conflict will be and how it will be resolved. Don't forget to add your own unique twists to make it stand out.
A crossover with One Piece might also work well. Joseph Joestar could find himself on the Grand Line, interacting with the Straw Hat Pirates. His hamon abilities could be a strange and new power for the pirates to encounter, and he could help them out in battles against the likes of the World Government or other powerful foes, while also learning about the Devil Fruits and Haki.
Well, in jjba the gamer fanfiction, a cool idea is the inclusion of quests related to the JJBA universe. Characters could be sent on missions to retrieve ancient artifacts that are related to their stands or family history. It adds a whole new layer of adventure to the story.
Some MLP fanfiction stories revolve around alternate universes. In one such story, the ponies could live in a world where magic has been lost. They then have to find ways to bring magic back, perhaps by going on a quest to discover ancient artifacts. This type of story allows for a lot of creativity and exploration of different scenarios.
Some JJBA fanfics that are worth reading are the ones that expand on the battles. They might add more complex strategies or new foes that the characters have to face. For instance, a fanfic could introduce a new stand user who has the power to manipulate time in a different way than Dio. Also, fanfics that give a different perspective on the existing story arcs, like seeing the events of Stardust Crusaders from an enemy's point of view, can be quite engaging.
Well, you can try looking on some popular fanfiction websites like Archive of Our Own. Just search for 'jjba x hateful reader' there and you might find a good selection. However, the availability of such stories may vary depending on how many authors have chosen to write in this particular niche.
There's also 'Diamond in the Rough'. This fanfic focuses on a unique relationship between the reader and a JJBA character. The writing style is very descriptive, especially when it comes to the Stand battles. It really brings the action to life and makes you feel like you're in the middle of the chaos.
The most interesting part is the power combination. For instance, seeing how Naruto's Rasengan would fare against a JJBA stand is really exciting.
One idea could be the Persona characters getting sucked into the JJBA universe. For example, the Phantom Thieves could end up in Morioh and have to deal with Stand users while trying to find a way back home. They might team up with Josuke and his friends to fight a common enemy that's causing chaos in both their worlds in a strange way.