In my opinion, the Black Eagles' story has its charm. Edelgard's journey to reform the empire is full of twists and turns. She has a strong will and is determined to break the old system, which makes the story engaging.
One popular 'fe3h fanfic' might be those that focus on character development. For example, fanfics that explore the backstory of Byleth in more depth. They can show his or her life before becoming a professor at the academy.
The Blue Lions' story stands out because of its emotional depth. Dimitri's internal struggle is so well - presented. You can really feel his pain, his confusion, and his growth. The bonds between the Blue Lions members are like family. Their shared history and the way they support each other through difficult times make the story so powerful. It's not just about battles and politics, but also about friendship and redemption.
Another interpretation is that it's a way to add depth to her character. By having a 'ghost story' associated with her, it makes her more than just a healer or a noble - turned - commoner. It could suggest that there are forces at work in the game world that are interested in her, either good or bad. Maybe there are supernatural entities that are drawn to her purity or her strong will, and this interaction is told as a ghost - like encounter.
The 'Mercedes ghost story' in FE3H could be a less - known aspect of the game's lore. It might be connected to her magic abilities too. Since she has a strong connection with the Church and uses magic, some might have crafted a story where her magic has an unexpected or spooky side - effect. Maybe she accidentally summoned something that was thought to be a ghost during one of her magical practices or battles. It could also be related to her relationships with other characters. For instance, if there are unresolved issues or emotions between her and another character, it could have given rise to a ghost - like narrative, like a haunting of sorts in the context of the story.
I'm not entirely sure specifically what 'fe3h lost items book of ghost stories' is about. It could potentially be a book within the Fire Emblem: Three Houses (fe3h) universe that combines the concept of lost items and ghost stories. Maybe it's about characters in the game finding lost items and encountering spooky things related to those items.
First, know the characters well. Replay parts of the game to really understand their personalities, motives, and backstories. This will help you write them accurately in your fanfic.
I'm not sure where exactly you can find the 'fe3h lost items book of ghost stories'. It might be hidden in certain areas within the Fire Emblem: Three Houses game world. Maybe in libraries or secret rooms.