Well, you could focus on a love story set within the 'a tale of blood and steel' world. For example, a warrior from one side falling in love with a healer from the opposing side. Their relationship would be full of challenges as their factions are at odds. Or, you could write about a young apprentice who discovers a dark secret about the ruling class in the 'a tale of blood and steel' and has to decide whether to expose it or keep it hidden, knowing that either choice could have dire consequences.
A typical 'A Tale of Blood and Steel' fanfic often has vivid descriptions of battles, characters with hidden motives, and a backdrop of a harsh world. The story might explore themes of loyalty and sacrifice. And, sometimes, it introduces new characters or gives existing ones alternate storylines.
A young and ambitious mage who is trying to prove herself in a world dominated by warriors. She might face discrimination and have to fight not only her enemies but also the prejudices within her own society. She could be a main character as she tries to make a name for herself using her magical abilities in the 'a tale of blood and steel' setting.
Another plot idea could be to put her in a situation where she has to team up with her enemies to face a greater threat. This would force her to set aside her differences and learn about her foes on a more personal level, leading to character growth for both her and the other characters.
One idea could be exploring the backstories of the different shipgirls in more depth. For example, how they came to be and their experiences before joining the fleet.
Well, you could write a fanfic that focuses on the backstories of the characters in 'Blood of Olympus'. Maybe explore how Percy Jackson became the hero he is from a different perspective. Or create a plot where the gods interfere more directly in the demigods' quests in the fanfic. This could add more drama and tension as the demigods have to deal with the gods' complex personalities and motives on top of their existing challenges.
Perhaps a fanfic where Naruto's blood has some special connection to an ancient and powerful demon. The demon is slowly being awakened due to some dark magic related to Naruto's blood. Naruto has to face not only the threat of the demon but also the distrust from some in the village who think his blood is a danger. He must prove that he can control this situation and keep the village safe.
Another plot could focus on the origin stories of some of the side characters. For instance, the backstory of Yukina Himeragi. How did she become an attack mage? What kind of training did she go through? A fanfic could expand on this and also show how her past experiences influence her actions and relationships in the present story.
One idea could be exploring the backstories of the characters more deeply. Maybe delving into their childhoods and how those experiences shaped them into the people they are in the story. Another could be creating an alternate universe where the main characters have different occupations or abilities.
One idea could be an OC who is a marine biologist in training and befriends Winter. The OC could help with her rehabilitation in new ways, like developing a special exercise routine. Another idea is an OC that is a young artist who is inspired by Winter's story and creates art to raise awareness for dolphin conservation. A third idea could be an OC who is a surfer and has a unique bond with Winter, sharing the love for the ocean.
Another plot idea might be to focus on the lives of the common people in Paris during the revolution in a fanfic of 'A Tale of Two Cities'. Show how they are caught up in the chaos, their hopes, and their fears. For example, create a story about a young peasant who becomes a key figure in the revolution, but then starts to question the extreme violence.