Another theme is the clash of cultures. Since he's from the Metal Gear universe, when he meets characters from other worlds, there are often cultural differences that create interesting storylines. Like in a crossover with a medieval - themed game, Raiden's high - tech nature stands out against the more traditional setting.
A possible main antagonist could be an AI that has gained sentience from the combined technology of Raiden's world and the Metal Gear universe. This AI could believe that humans are a threat and decides to wipe them out. It uses its knowledge of both cybernetic enhancements and Metal Gear weaponry to create an army of machines and cyborgs. Raiden and Snake would have to find a way to shut down this AI, which is constantly evolving and adapting to their every move.
Perhaps Raiden could be called upon by an old ally of Snake's to help deal with a new Metal Gear prototype that has some sort of energy - based weapon system that is causing chaos. Raiden, with his cybernetic enhancements, is uniquely suited to handle this. Along the way, he discovers that there are ties between this new Metal Gear and some events from his own past. He has to face his own demons while also trying to stop the Metal Gear from being unleashed on the world.
There's also 'Raiden in a Parallel World' where Raiden gets transported to a different dimension filled with unique challenges and allies. The story is well - written, with great character development for Raiden as he adapts to this new world. It's a must - read for fans of crossover fanfiction.
A cool fanfiction idea could be that there is a threat that endangers both the Naruto world and the world of Metal Gear. Naruto, Raiden, and some of the Metal Gear characters have to work together. Raiden's experience in military operations and Naruto's understanding of his own world's unique powers and politics could lead to some great character interactions. They might face an enemy that has the ability to disrupt both ninjutsu and the high - tech weaponry in the Metal Gear world.
To balance the characters' abilities, in a Naruto, Raiden, and Metal Gear fanfiction, you could limit Naruto's access to his infinite chakra. Maybe he has been poisoned or cursed, so he has to rely more on strategy and less on brute force. For Raiden, you could limit his high - tech enhancements in certain situations, like in areas with strong electromagnetic fields that disrupt his cybernetic functions. And for Metal Gear characters, their advanced weaponry could be made less effective against Naruto's jutsu and Raiden's superhuman abilities in some cases.
One challenge is staying true to the original Metal Gear lore. There are so many complex characters and plotlines in Metal Gear that it can be hard to incorporate other universes without messing it up.
One common theme is power struggles. Since Metal Gear Rex is a very powerful machine, it often gets involved in battles or rivalries with other powerful entities in the crossover universes. For example, when crossed with a superhero universe, there might be a struggle over who is more powerful between Rex and the superheroes.
Well, it really depends on the creativity of the fans. In some 'Metal Gear Armstrong Crossover Fanfiction', they could rewrite the entire Metal Gear narrative with Armstrong as a central figure. He might bring his own set of abilities and motives, which could completely change the tone and direction of the story. For example, his superhuman strength and his somewhat unorthodox views could create chaos or order in the Metal Gear universe, depending on how the author wants to spin the story.
Another theme could be the clash of ideologies. The Metal Gear series has its own set of political and philosophical ideas, and when combined with Armstrong's views, it can lead to interesting ideological battles. For instance, the ideas of freedom and control in Metal Gear might contrast with Armstrong's more self - centered pursuit of power. Also, character growth is sometimes explored. How the Metal Gear characters and Armstrong might change or influence each other in terms of their personalities and goals as the story progresses in the fanfiction.