Perhaps the fanfic explores how the technology from Metal Gear might be incorporated into the RWBY universe. It could be about creating new weapons or gadgets for the RWBY characters using the advanced tech concepts from Metal Gear. This might change the power dynamics and the way battles are fought in the RWBY world.
One idea could be a crossover where the characters from Metal Gear Rising have to adapt to the world of RWBY. For example, Raiden could team up with Ruby and they could share their combat skills. Maybe Raiden teaches Ruby some advanced sword techniques, while Ruby shows Raiden how to use Dust in combat.
One idea could be a crossover where the characters from RWBY have to adapt to the high - tech, cybernetic world of Metal Gear Rising. For example, Ruby could be fascinated by the advanced weaponry and try to incorporate some of the technology into her Crescent Rose. Another idea is a story where the villains from Metal Gear Rising are somehow transported to the RWBY universe and cause chaos, forcing the RWBY teams to team up with the heroes from Metal Gear Rising to stop them. A third idea might be a character - study type of fanfiction, focusing on how a character like Raiden would react if he found himself in the RWBY world with its unique magic and Grimm threats.
One interesting concept could be the fusion of the unique fighting styles from RWBY and the stealth elements of Metal Gear. For example, characters from RWBY might incorporate Metal Gear's sneaking techniques into their battles in the fanfiction.
Perhaps a story where some of the Metal Gear technology finds its way into the Naruto world. Orochimaru might be interested in getting his hands on such advanced tech for his experiments. He could try to reverse - engineer it to enhance his own abilities or create new, powerful jutsu. And Konoha would have to deal with the threat of this new, unknown technology while also facing their regular enemies.
One idea could be an OC who is a master of stealth technology, perhaps even surpassing Snake in some ways. They could be on a mission to uncover a new type of Metal Gear that has been secretly developed by a rogue faction within the military - industrial complex. Another plot could involve an OC who has a unique connection to the AI systems in the Metal Gear universe, and they have to prevent the AI from going rogue and causing global chaos.
One idea could be to have Naruto characters infiltrate a Metal Gear - like facility. For example, Naruto's shadow clones could be used to distract the guards while Sasuke tries to find and disable the main weapon system, similar to how Solid Snake would operate in the Metal Gear Solid games.
Some fan fictions might also focus on the relationship between Snake and the environment. Since the game is set in a jungle, there could be stories about how Snake adapts to the jungle in unique ways, or how the jungle itself seems to have a sentience of sorts and affects the events of the story.
Well, an interesting OC for Metal Gear Solid fanfiction could be a child soldier who was rescued by Solid Snake and then grows up to become an ally with unique combat skills. They could have a special bond with Snake and be involved in some of the major missions. You could also think about an OC who is a hacker that infiltrates the enemy's systems in a different way compared to the existing characters in the game.
Well, in Metal Gear Solid fanfic, a cool concept is the expansion of the technology in the game world. Fans might write about advanced versions of the Metal Gear mechs or new types of stealth technology. Also, some fanfics explore the backstories of minor characters in more depth, which gives a whole new dimension to the overall Metal Gear Solid lore.
One interesting concept could be the combination of different Metal Gear characters in unexpected scenarios. For example, seeing Solid Snake team up with characters from other Metal Gear games in a mission that spans multiple game settings. It can bring new dynamics and interactions that we don't see in the original games.