One great Gundam Build Divers Re:RISE fanfiction is 'The New Divers'. It focuses on a group of new divers who enter the Gunpla Battle Nexus with unique strategies. Another is 'Reimagining Re:RISE' which re - interprets the events of the series in an interesting way. And 'Divers' Secret Missions' is also good as it creates exciting side - quests for the characters.
One interesting crossover could be the ninja skills of Naruto characters being applied in the Gundam Build Fighters battles. For example, Naruto's ability to clone himself could be used in a strategic way in a Gundam fight. Maybe a Naruto character could use their chakra to enhance the performance of a Gundam. Another aspect could be the sharing of values. Both Naruto and Gundam Build Fighters often deal with themes like friendship and determination. So, characters from both universes could bond over these shared values and fight together against common enemies.
One interesting concept could be the combination of different Gundam universes' technologies. For example, seeing the mechanics from the original Gundam series combined with those from Gundam Wing. It creates unique and powerful mobile suits that haven't been seen before in the official lore.
Char Aznable, even though he's from the original Gundam series, is a very popular character in these crossovers. His complex personality and his iconic status make him a character that fans love to see interact with the Build Fighters characters. Whether he's an ally or an adversary, he always brings a lot of drama to the story.
I think 'Gunpla Dreams' is very creative. It takes the concept of Gunpla building and turns it into a sort of dream - like adventure where the characters'Gunpla creations come to life in unexpected ways. Another is 'The Virtual World's Edge' which explores the boundaries of the Gunpla Battle Nexus in a really imaginative way. And 'Divers' Quantum Leap' where the divers experience jumps in time and space within the virtual world.
One good crossover could be where Naruto characters learn about the Gundam Build Fighters concept. For example, Naruto himself might be intrigued by the idea of building and piloting Gundams. He could use his chakra in unique ways to enhance the Gundam's performance. Another aspect could be Sakura using her medical skills to assist in the repair and maintenance of the Gundams. And Sasuke might be interested in the strategic aspects of Gundam battles and adapt some of his ninja fighting strategies to Gundam combat.
In fanfiction, the merge could happen because of a powerful jutsu gone wrong. This jutsu could distort space - time and connect the two universes. In the merged world, the Gundam pilots would have to deal with the threat of ninja attacks. They could use their Gundam building skills to create mechas that are better equipped to handle ninja abilities like genjutsu. Meanwhile, the Naruto characters would be fascinated by the Gundam battles and might try to participate using their own combat skills.
Char Aznable would also be a very interesting character to include. His rivalry with Amuro could be re - ignited in the Build Divers' world. Also, Kira Yamato from 'Gundam SEED' could be a great fit. His Coordinator abilities and his strong sense of justice could lead to some great storylines, like him teaching the Build Divers new ways to use their Gundams' capabilities.
One idea could be a crossover with a mecha from another well - known series. For example, having a Gundam from Gundam Build Fighters team up with a Macross Valkyrie. They could face a common enemy that requires both their unique abilities to defeat.
A cool plot for Gundam Build Divers Crossover Fanfiction could be a time - traveling crossover. The Build Divers accidentally travel to different eras of Gundam history. They might have to help the original pilots in those eras while also trying to find their way back home. Or perhaps a crossover where the Build Divers enter a virtual world created by an enemy that combines elements from multiple Gundam universes, and they have to fight their way through this strange new world.