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, first, the fanfic should respect the lore of both SCP and JJBA. If it starts messing up the basic rules of either franchise, it can be a turn - off. The pacing is also crucial. A good crossover will have a well - paced story that doesn't rush through the interactions and developments. And finally, the world - building. How the two universes are merged should be creative and believable, like how the locations from JJBA fit into the SCP facilities or vice versa.
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.
One popular SCP JJBA crossover fanfiction is 'SCP - JoJo's Bizarre Adventure: The Stand Users'. It combines the unique and often dark elements of the SCP universe with the flamboyant and power - based world of JJBA. The story weaves together the two in a way that keeps readers on their toes, as characters from both universes interact in unexpected ways.
Kakyoin and Luffy from One Piece would be an unexpected but fun pairing. Kakyoin's calm and strategic mind would be an interesting contrast to Luffy's carefree and impulsive nature. They could work together in a battle, with Kakyoin using his Hierophant Green to create distractions or attack from a distance while Luffy charges in head - first, using his Gum - Gum powers to take on enemies directly.
One idea could be a crossover with another popular anime like Naruto. For example, Jotaro could meet Naruto and they could have a battle of wills and powers. Naruto's positive attitude might clash with Jotaro's more stoic nature.
Well, it could be about the JoJo characters getting transported into the Warframe universe. They might team up with the Tenno to fight against common enemies like the Infested. For example, Jotaro could use Star Platinum's power along with a Warframe's abilities to take on hordes of foes.
One idea could be that Kira Yoshikage from JJBA somehow ends up in the Naruto world. Maybe his Stand ability could be misinterpreted as some kind of strange ninja jutsu. He might try to live his quiet life there, but his actions would surely draw the attention of the ninja. For example, if he starts using his Stand to kill people in the ninja villages, it would be like a new and unknown threat to the ninja, and they would have to figure out how to deal with it.
Akira and Giorno would make an interesting pairing. Akira has his leadership skills and the ability to use Personas, while Giorno has his determination and powerful Stand, Gold Experience. They could learn from each other's sense of justice and different ways of achieving their goals. Akira could teach Giorno about the power of the collective, as the Phantom Thieves work as a team, and Giorno could show Akira how to be more assertive and decisive in his actions.
Well, you could focus on the character crossovers. Imagine Jotaro Kujo meeting Ichigo Kurosaki. Jotaro's cool and collected demeanor would contrast with Ichigo's more hot - headed nature. They could learn from each other's fighting styles. And then there's the possibility of Stand users having to adapt to the spiritual energy in the Bleach world and vice versa. This could lead to some really interesting power - up and training sequences for the characters involved.