How about the idea of the ninjas from Naruto trying to find a way to reverse the radiation in Fallout 4? They could use their chakra knowledge and skills. Hinata could use her byakugan to detect sources of radiation more accurately. And Naruto could use his positive energy and willpower, which is often associated with his chakra, to try and purify some of the polluted areas.
Naruto himself would be a great fit. His determination and never - give - up attitude would serve him well in the harsh Fallout 4 world. He could inspire the survivors there with his positive outlook. Also, Kakashi would be a good fit. His intelligence and combat skills, along with his sharingan, would make him a formidable force against the various threats in the wasteland.
One possible plot could be that the RWBY characters find themselves in the Fallout wasteland. Ruby could use her scythe skills to fight off the mutated creatures in the wasteland. Weiss might struggle with the harsh and dirty environment compared to her usual posh settings but use her glyphs in unique ways against raiders. Blake could use her stealth to navigate dangerous areas, and Yang's strength would be useful in hand - to - hand combat with the tough Fallout foes.
The cultural clash is also very interesting. The Star Wars universe has a very different social and cultural structure compared to the Fallout world. The Jedi and Sith codes of conduct, for example, are very different from the survival - of - the - fittest mentality often seen in Fallout. This contrast can lead to some great character development and story arcs.
One idea could be that the characters from RWBY end up in the Fallout wasteland. Ruby could use her scythe skills to fight off raiders and mutants. Weiss might use her glyphs to protect the group from radiation in certain areas. Another idea is that the Dust from RWBY could be a valuable resource in the Fallout world, leading to various power struggles.
In 'fallout naruto fanfiction', the unique part is how the characters from both universes interact. For example, Naruto's skills like the Rasengan could be used in a completely different way in the Fallout world. Maybe against some huge mutated beast. And the Fallout characters might be in awe of Naruto's ability to use chakra. It's this cross - over of abilities and cultures that makes it stand out.
One idea could be to cross the Sole Survivor with a character from another post - apocalyptic game like Metro. The Sole Survivor could bring their unique skills and knowledge from the Fallout universe into the Metro tunnels. They might have to deal with different kinds of mutants and a more claustrophobic environment. It would be interesting to see how they adapt and interact with the Metro characters.
You need to stay true to the personalities of the characters. The Sole Survivor has a certain set of values and skills developed in the Fallout world. If they are crossing over with a character from Final Fantasy, for instance, make sure their interactions are believable. The Sole Survivor might be skeptical of magic at first but then learn to work with it. Develop their relationship gradually as they face challenges together.
Ruby would probably be excited by the new and different kinds of challenges in the Fallout world. She'd quickly learn to use the weapons she finds there while still relying on her Crescent Rose. Weiss would have a harder time adapting to the dirt and grime, but her determination would make her find ways to use her magic in this new environment. Blake would likely be more at ease in the shadows of the ruined buildings, using her stealth to her advantage.
Ruby would be very interesting. Her innocent and eager - to - help nature would be a contrast to the desolate and often cruel Fallout world. She'd likely be the one to immediately try to make things better, whether it's helping a settlement or fighting against the bad guys. Her speed and combat skills with her scythe would also make her a force to be reckoned with in the wasteland.