A common theme is the exploration of Raiden's humanity. Since he is a cyborg, fanfictions often dig into how much of his human side remains. Another theme is the power struggle. Given the high - octane action in the game, fanfics often play with who has the most power and how it's obtained. Also, the idea of revenge is prevalent, as the title implies.
Perhaps there could be a story where some of the Metal Gear Rising characters are reincarnated as ninjas in the Naruto world. They retain their memories and abilities from their previous lives. Raiden, for instance, could be reborn as a member of a minor ninja clan. He would then rise through the ranks, using his unique skills and determination, and eventually play a major role in the events that shape the Naruto world, all while trying to figure out why he was reincarnated in this strange new place.
Well, the theme of redemption can also be found in some 'Metal Gear Revengeance male reader fanfiction'. The male reader might have a past that they are trying to atone for, and their journey in the Metal Gear universe becomes a path towards redemption. Additionally, the exploration of power and its consequences is another theme. The male reader may gain new powers or abilities in the story and has to deal with the implications of using them, whether it's for good or bad.
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.
One great 'Metal Gear Rising: Revengeance' fanfiction is 'The Blade's Redemption'. It delves deeper into Raiden's internal struggles post - game. Another interesting one is 'Rising Shadows' which explores the side characters more thoroughly. And there's also 'Revengeance Reimagined' that takes the story in a completely new and exciting direction.
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.
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 a fanfiction called 'Into the Warzone' in the 'Metal Gear Revengeance male reader' genre. It's quite interesting as it places the male reader in the middle of the chaotic war scenarios of the game world, with detailed descriptions of battles and strategies.
Another way they could interact is through a trading of skills. Naruto, with his ability to create multiple clones, could teach this technique to the Metal Gear Rising characters. In return, Raiden could teach Naruto some of his sword - fighting skills. This exchange of skills could create new and exciting combat styles for both parties and also help to build relationships between the characters from the two different universes.