Well, there might be characters who are masters of Renkin. They would be important as they hold the knowledge and power related to Renkin in the story. There could also be some sort of guardians or protectors of the Renkin world. They would be key in maintaining the balance and order in the world that Jeanne d'Arc enters.
One possible fanfiction could be about Ritsuka and Jeanne d'Arc going on a journey through different historical eras. They might encounter various challenges and form a deep bond as they fight side by side against different threats. This could be an adventure - filled story that showcases their different personalities and skills.
A plot could also involve a tournament or competition. Ritsuka and Jeanne d'Arc enter a grand tournament where they have to compete against powerful opponents. As they fight in the tournament, they learn more about each other's fighting styles and strategies. They also have to deal with the politics and rivalries within the tournament, which adds more depth to the story. This could be a story full of action and excitement.
One of the main themes could be the clash between different eras. Jeanne d'Arc comes from a historical and more 'primitive' era in a sense, while the world of Renkin likely has more advanced elements. Another theme might be heroism. Jeanne d'Arc is a well - known hero figure, and her presence in the Renkin world may explore different aspects of what it means to be a hero, like facing new and strange challenges. Also, the concept of adaptation could be a theme. How does a character from one context adapt to a completely different world with different rules and values.
One common theme is the clash and fusion of different cultures. Naruto comes from a ninja - based culture in a fictional world, while Jeanne is from a historical and religious context. Their meeting often leads to an exploration of how these different cultural elements interact.
Their interaction could be initially rocky. Naruto is loud and brash, while Jeanne is more reserved and devout. But as they get to know each other, they could learn from one another. Naruto could show Jeanne some of his ninja tricks, and Jeanne could teach Naruto about her cause and the importance of her mission.
One common theme is adventure. Given Jeanne d'Arc's historical and often heroic portrayals, the fanfics might involve the male reader joining her on some grand adventure, fighting battles side by side. For example, they could be on a quest to save a kingdom or defeat an evil force.
Well, I'm not sure of the exact name, but there are some 'naruto x jeanne d'arc fanfic' that explore the idea of Naruto being transported to Jeanne's world. In these stories, Naruto has to adapt to a completely different environment and time period. He brings his ninja techniques which are seen as something very strange and powerful in Jeanne's world. And Jeanne, in turn, shows Naruto her own way of fighting for what she believes in, which is quite inspiring.
Well, one possibility is that Naruto's unique skills and chakra would completely baffle Jeanne and her comrades. His ability to create multiple clones might be mistaken for some sort of dark magic at first. Maybe Naruto would use his Rasengan in battle against Jeanne's enemies, which would be a completely new and unheard - of form of attack in her world.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics on various topics, including Jeanne d'Arc x Male Reader ones. Just use the search function and type in the relevant keywords to find what you're looking for.