Well, a 'Breath of the Wild Fi fanfic' could explore Fi's origin in more depth. Maybe there could be a story where Fi discovers secrets about her own creation that were hidden from her. Also, a fanfic could focus on Fi's interaction with the different races in the game world. She could learn their cultures and values, which would be really fascinating to read about.
One interesting concept could be Fi exploring the world outside of her normal duties. She might encounter new characters and have to adapt to a more free - roaming lifestyle. Another concept could be a fanfic where Fi forms a bond with Link in a different way than in the game, perhaps as a more equal partnership.
One idea could be Paya's adventures in exploring a new, uncharted area of Hyrule. She could discover ancient Sheikah secrets that were lost to time. Another idea is a fanfic where Paya has to face a powerful enemy on her own and overcomes it through her wits and the skills she has learned. Maybe a story about Paya forming an unexpected friendship with a character from a different race in Hyrule, like a Goron or a Zora, and how they learn from each other's cultures.
Another interesting aspect could be a magical or mysterious force that binds the harem together. It could be an ancient Hylian magic that is awakened when Link forms these special relationships. This force could give them new powers or abilities that they use to face the threats in Hyrule.
The fanfic could also introduce strange new worlds or dimensions. Naruto might find himself in a place that is completely different from the Hidden Leaf Village, with different rules of nature and power. This could lead to exciting adventures where he has to adapt and learn new things to survive.
One interesting plot idea could be Zelda's pregnancy adding a new layer of vulnerability. The story could focus on how she has to balance her responsibilities as a future mother and her role in the fight against Ganon. For example, Link might become more protective, and this could create some tension within their relationship as Zelda still wants to be actively involved in the battle plans. Another idea is that the pregnancy could be a sign of hope for the kingdom. It could symbolize a new beginning and give the people of Hyrule something positive to look forward to during the dark times.
One idea could be a male reader who is a skilled archer from another land and gets transported to the world of Breath of the Wild. He then teams up with Link to fight against Ganon. Another could be a male reader who discovers he has a special power related to the Sheikah technology and uses it to help the people of Hyrule.
First, you should really study Fi's character in the game. Notice her mannerisms, how she speaks, and her role. Then, come up with an interesting plot idea. It could be something like Fi going on a solo adventure. After that, start writing a basic outline of the story, including the beginning, middle, and end.
Well, some fanfic ideas might involve Link being bound by some dark magic and having to rely on his wits and the help of the spirits in the game to free himself. Or Zelda could be in a state of bondage due to a plot by an evil force, and the story could revolve around how the different races in the game come together to save her. There could also be a fanfic where a minor character is in bondage and Link stumbles upon them during his adventures and decides to help.
One interesting concept could be the fusion of Naruto's ninja abilities with the unique powers from 'Breath of the Sun'. For example, Naruto might use his chakra in new ways inspired by the Breath of the Sun techniques. Another concept could be the new characters or clans that are introduced in this fanfiction. They might have abilities related to both Naruto's world and the Breath of the Sun concept. Also, the story could explore how the ninja world would react to the sudden appearance of these new powers and how they would be integrated into the existing power structure.
One idea could be exploring Link's life before he woke up in the Shrine of Resurrection. Maybe he had a family or a special friendship that was lost. Another plot could be a story where Zelda gets lost in a new, uncharted part of Hyrule and Link has to find her using only his wits and the help of some new, unique characters. A third plot idea is to have a fanfiction where the monsters in Breath of the Wild form an alliance to take over Hyrule, and Link has to find a way to break their unity and save the kingdom.
One interesting plot could be about Link having to face a new, more powerful and mysterious version of Ganon that was created as a result of the original Ganon's defeat. It adds a new layer of challenge to Link's journey.