One idea could be a story where the male reader is from a different land and has unique skills or knowledge. He meets Corrin and teaches her about his homeland's culture, and they bond over that. For example, he could show her a new form of magic or a different style of combat that helps Corrin in her own battles and adventures.
Another option is to look for dedicated Fire Emblem fanfiction communities. They often have moderators who ensure the content is family - friendly. You could find some heartwarming 'female corrin x male reader' stories there. Maybe a story where the male reader character helps Corrin in a battle, and from that, a deep friendship and then love begins to grow in a very pure and innocent manner.
Some fanfics might explore the idea of power dynamics. Given that Corrin may have certain powers in her original context, how she and the male reader interact in terms of power - like who protects whom, or how they combine their strengths - can be an interesting theme. There can also be a theme of self - discovery. As the male reader gets involved with Corrin, he may discover new aspects of himself, his abilities, or his place in the world of the story.
One common theme is adventure. The male reader often joins Corrin on her quests and battles in the Fire Emblem world. They face challenges together and grow closer through their shared experiences.
Rather than seeking 'lemon' fanfiction, which may not be in line with the ethical and content guidelines of many communities, consider looking for fanfiction that delves into the character development of Corrin and Azura. For example, how their different backgrounds and personalities interact, or how they might overcome challenges together. There are likely many creative and engaging stories out there that don't rely on inappropriate themes.
One common theme is adventure. Since both Male and Female Corrin are often involved in battles and quests in the game, fanfictions might continue their adventures together, facing new enemies and challenges.
Common themes could include friendship development. They might start as acquaintances and gradually become close friends, sharing secrets and having adventures together. Another theme could be mutual respect. They learn to respect each other's differences, whether it's in their combat styles or cultural backgrounds.
Sorry, I'm not aware of specific non - lemon Camilia x Female Corrin fanfiction. You could try searching on popular fanfiction platforms like Archive of Our Own. Use the filters to exclude mature content and look for works tagged with Camilia and Female Corrin.
You can try some popular fanfic websites like Archive of Our Own (AO3). It has a large collection of fanfictions across various fandoms, and there's a good chance you'll find some great 'female corrin x male reader' fanfics there.
You can also check out some Fire Emblem - related forums. Sometimes fans share their fanfictions there. Just be aware that the quantity might be smaller compared to the big fanfiction platforms.