A plot idea could be that Fem Naruto is mute because of a curse. As she tries to break this curse, she embarks on a journey filled with self - discovery. Along the way, she meets different characters who either help or hinder her progress. Her muteness makes her more observant, and she uses this to her advantage, learning secrets about the ninja world that others overlook.
One idea could be that Naruto has to find new ways to communicate his strong will and determination without speaking. Maybe he uses sign language that he invents himself, and his friends gradually learn to understand him. This could lead to some really heartwarming moments of connection.
One idea could be that their pregnancies bring the two villages closer together. With Fem Naruto and Gaara both expecting, it could lead to a new era of peace as the two most powerful ninja from their respective villages are about to become parents. This could involve joint efforts in protecting the future of their children, like creating a new safe haven for the new generation.
One idea could be that they have to face the challenges of being pregnant in a world full of shinobi battles. Maybe they have to hide their pregnancies from enemies who might see it as a weakness. Another could be that they support each other through the physical and emotional changes, and their friendship grows even deeper during this time.
One idea could be that Naruto discovers a mute girl in a hidden village during one of his travels. Shikamaru gets involved as Naruto tries to find a way to communicate with her. Maybe she has a unique power that only she can use, but because she's mute, she has trouble expressing it. Naruto's determination and Shikamaru's intelligence work together to help her out.
One plot idea could be Naruto finding unique ways to communicate his ninja skills despite being mute. For example, he might use hand signals in a more complex way than normal. Since he's blind, he could develop an extraordinary sense of hearing to detect enemies. Another idea is that he forms a special bond with an animal that helps him 'see' the world around him, like a seeing - eye hawk or something.
A possible plot is that Naruto, mute as he is, discovers a new form of magic in the DxD universe that is related to silent communication. This could lead to him becoming a very powerful figure as he can communicate secretly with his allies during battles. Also, his backstory from Naruto could be intertwined with the DxD lore. For instance, his experience with loneliness in his own world could make him more empathetic towards the devils in DxD who are often misunderstood. He could then try to bridge the gap between different factions in the DxD world.
One idea could be that the mute prodigy has a unique form of ninjutsu that doesn't require speaking. Maybe they can use sign language to cast powerful jutsus. Another plot could involve the character being misunderstood because of their muteness, but gradually proving their worth. For example, in a mission, they use their silent skills to outwit the enemy.
One idea could be Naruto being mute in a crossover with the Harry Potter universe. He might communicate through magic signs or a special spell - created device. This could lead to him being misunderstood at first, but then his unique abilities, like his ninja skills, would shine through as he helps Hogwarts students in a new way.
A more complex plot could involve the fem Kyuubi in heat influencing Naruto's dreams. In his dreams, she shows him a future where they are together, but in a rather possessive way. Naruto then has to struggle with whether he should accept this new relationship dynamic or fight against it. He might also seek help from his friends like Kakashi or Shikamaru, who could give him different perspectives on dealing with the fem Kyuubi's possessive behavior.
One plot idea could be that fem Naruto, with her tenacious spirit, meets Izuna in a time - travel scenario. She tries to prevent some of the tragedies that befell the Uchiha clan. Another could be a story where they team up to face a new, powerful enemy that threatens both the Hidden Leaf and the Uchiha. Maybe fem Naruto's unique abilities combined with Izuna's skills create a formidable duo.