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.
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 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.
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 interesting plot idea could be a crossover where Naruto's senjutsu abilities are combined with another universe's magic system. For example, if he were to cross over into the Harry Potter universe, he could use senjutsu to enhance his magic or even teach the wizards about chakra. Another idea is a crossover with the Dragon Ball universe, where Naruto's senjutsu clashes with the ki energy of the Saiyans. Maybe he has to use senjutsu to face off against a powerful Saiyan who has come to the Naruto world. Or a crossover with the Bleach universe, and Naruto uses senjutsu to interact with the spiritual energy there, perhaps even helping Ichigo in a battle against a powerful Hollow by using his unique senjutsu skills.
One plot idea could be that Naruto characters end up in Ikebukuro. For example, Naruto himself could be searching for a new type of ninja tool that he heard can only be found in Ikebukuro. Meanwhile, the gangs in Durarara start to notice this strange, orange - clad boy with strange powers. Another idea is a character swap where some of the Durarara characters gain ninja abilities and get involved in Naruto - style battles in their own world. Maybe Celty could use her shadow powers in a more ninja - like way, like stealth and quick attacks.
One idea could be that Naruto characters are transported into the Splatoon world. They might initially be confused by the ink-based battles and the unique species. For example, Naruto could mistake an Inkling for a strange ninja from another land and challenge them to a friendly spar, only to find out about the ink shooting mechanism. Another plot could involve the Akatsuki from Naruto trying to steal the valuable ink resources in the Splatoon world for their own purposes. They would face off against the Splatoon heroes who are determined to protect their world's resources.
A cool plot could be that there's a tournament across different anime worlds, and Inuyasha and Naruto are chosen to represent their respective worlds. Along the way, they discover similarities in their pasts, like both having some form of demon - related heritage (Naruto with the Nine - Tails and Inuyasha being a half - demon). They also exchange combat techniques. Naruto teaches Inuyasha how to better use chakra control in his attacks, and Inuyasha shows Naruto some unique sword - fighting skills.
One interesting plot idea could be that Kaguya is reborn in the modern Naruto world. She has no memories of her past at first. Naruto discovers her and senses a strange power within her. As she starts to regain her memories, she struggles between her old self and the new world she's in. Naruto has to decide whether to trust her or not.