A plot twist could be that the Quirk system and Stands are somehow related. Maybe there was an ancient event that split the power into two forms. This would open up a whole new exploration of the lore in both universes. Characters would have to reevaluate their understanding of their own powers and how they interact with those from the other universe.
Uraraka's zero - gravity Quirk could work well with a Stand like The World. She could make objects weightless and then use The World's time - stop to position them in the perfect place for a powerful attack. For example, making a large boulder weightless, stopping time, and then moving it right above an enemy before time starts again.
Well, Izuku Midoriya is no doubt one of the most popular characters in these crossovers. His journey to become a great hero in My Hero Academia can be enhanced in fanfiction when elements from JoJo are added. He could inherit a stand that helps him better understand and control his One For All quirk. Another popular character is Giorno Giovanna. His ability to create life and his complex backstory can be blended with the hero - villain dynamics of My Hero Academia. And Momo Yaoyorozu, with her intelligent and creative quirk, can be paired with a JoJo character to create a unique team - up or rivalry in fanfiction.
Well, in some My Hero Academia JoJo fanfiction, there are crossovers where the characters' personalities are blended. Deku might take on some of Jonathan Joestar's noble traits. And in terms of the storylines, there could be a scenario where the One For All quirk is somehow related to a stand's power source. This could lead to a whole new adventure where Deku has to not only master his quirk but also understand the stand - like aspect of it.
One great 'My Hero Academia' crossover fanfiction is the one where they cross over with 'One Piece'. It combines the unique powers of the 'My Hero Academia' world with the adventurous and diverse world of 'One Piece'. The characters interact in really interesting ways, like Midoriya being amazed by Luffy's Devil Fruit powers and Luffy being intrigued by the concept of Quirks.
One idea could be that Kakashi is somehow transported to the My Hero Academia world. He could become a teacher at UA, using his ninja skills and wisdom to train the students in new and unique ways. His Sharingan would be a very interesting power in the MHA universe.
One idea could be that Godzilla arrives in the My Hero Academia world during a major villain attack. The heroes initially see Godzilla as a threat but soon realize that he is targeting the same villains who are causing environmental destruction. His massive size and power could be a game - changer in the battle.
There's also 'Stand Users at U.A. High'. This fanfic has really cool crossovers of abilities. For example, it shows how Josuke's Crazy Diamond could be used in hero training scenarios at U.A. It also delves into how the students from My Hero Academia would react to the more out - there personalities from JoJo's, like Jotaro's stoicism.
One interesting plot point is the clash of power systems. In these fanfics, seeing how stands from JoJo's interact with quirks in My Hero Academia can be really exciting. For instance, how would a stand user deal with a villain whose quirk nullifies physical attacks? Another is the cultural differences between the two universes. The more flamboyant and often morally ambiguous nature of JoJo's characters compared to the more straightforward hero - and - villain setup in My Hero Academia creates a lot of tension and interesting character dynamics.
A great crossover idea is with the Dragon Ball series. The powerful Saiyans could interact with the My Hero Academia characters. Goku could train the students at UA to reach new levels of power. Also, a crossover with the Attack on Titan world would be intense. The heroes would have to deal with Titans in a whole new way and use their quirks in that battle - filled environment.