In this crossover, Broly's uncontrollable rage could be a central theme. Maybe in the Black Lagoon world, there's something that could potentially calm him down or at least direct his rage towards the right enemies. Like a powerful artifact or a character with special abilities. And the Lagoon Company could be on a mission to find this solution while also using Broly's strength in battles.
One idea could be that Broly somehow ends up in the world of Black Lagoon. He might initially be seen as a huge threat by the Lagoon Company. But as the story progresses, they realize his power can be useful against their common enemies. For example, when facing powerful crime syndicates or military forces that are too much for them to handle alone.
Well, Broly is extremely powerful and has a short temper. The characters in Black Lagoon are tough but not on Broly's level. So, there would be a lot of tension at first. For instance, Revy from Black Lagoon is used to being in control in a fight, but Broly would completely overpower her. This would create a power struggle within the group.
One idea could be that Naruto and his team are sent on a mission to the world of Black Lagoon. They team up with Rock to take on a powerful crime syndicate that is after a powerful jutsu Naruto has. Another could be that Revy gets transported to the Naruto universe and has to deal with the shinobi world's politics while also teaching some of the younger ninjas her combat skills.
A Broly crossover with the Naruto universe could be really cool. Picture Broly in the Hidden Leaf Village, his incredible power causing quite a stir. Maybe he could get involved in the fight against the Akatsuki, using his brute strength in a world of ninjas. It would be interesting to see how he adapts to chakra and ninja techniques.
One idea could be that Godlike Broly crosses over into the Dragon Ball Super universe and challenges Goku and Vegeta at their peak forms. His overwhelming power could force them to seek new power - ups and training methods.
One idea could be a crossover with the Dragon Ball Z heroes. Broly could team up with Goku and Vegeta to face a new, even more powerful enemy from another universe. This would bring out different fighting styles and power combinations.
One idea could be that Broly ends up in an alternate universe where he has to team up with Goku and the Z - fighters to fight a new, even more powerful enemy. This would force Broly to control his anger and work with his former foes.
One idea could be the characters reacting to a modern-day action movie. They might be both amused and critical of the over - the - top stunts and special effects compared to their own gritty reality. For example, Revy could be making sarcastic comments throughout the screening.
One idea could be that Broly is transported to an alternate universe where he teams up with Goku from a different timeline to fight a new, powerful enemy. They have to combine their unique fighting styles to stand a chance.
In a crossover with One Piece, Luffy could be an ally. Luffy is known for his open - mindedness and ability to befriend almost anyone. He would see Broly's power and might try to get him to join his crew or at least fight alongside him against common enemies. They could have some really fun interactions, like Luffy trying to make Broly laugh or share his love for food with him.
Perhaps a fanfiction could focus on Shenhua's past. Show how she became the skilled fighter she is in the present. It could involve her training under a strict master in a remote location and the events that led her to the Black Lagoon area.