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.
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.
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.
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 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.
Perhaps Link's hair is a conduit for the spirits of the land. When he communes with nature, his hair moves in a way that seems to be in harmony with the wind, trees, and animals. This could be a really spiritual and immersive fanfic idea.
One idea could be a crossover with the Legend of Zelda: Ocarina of Time. Link from Breath of the Wild could meet Young Link and they could team up to fight a common enemy that has somehow traversed between their timelines. Another could be a crossover with a non - Zelda franchise like Final Fantasy. Link might encounter a group of Final Fantasy characters in Hyrule and they have to combine their skills to save both their worlds from a dark force.
One idea could be exploring Link's life before he woke up in the Shrine of Resurrection. Maybe he had a family or a best friend in a small village that was lost during the Calamity. Another idea is to focus on Zelda and her struggles with her powers in a more in - depth way, like her inner thoughts and fears during her time trying to unlock her sealing power.
Well, a Breath of the Wild Link x Harem fanfic can be both exciting and challenging to write. On one hand, there are so many interesting characters in the game that could potentially be part of Link's harem. On the other hand, the writer has to manage all these relationships and make them believable. It's not just about having a bunch of characters together, but about creating a coherent story where Link's character develops through these relationships and the interactions with his harem members are meaningful.
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.