One idea could be that the daughter of an Anbu member is discovered to have a unique Kekkei Genkai. This leads to her being closely watched by the Hokage, Naruto in this case. Maybe she has the power to manipulate time on a small scale, which could create all sorts of interesting scenarios in the ninja world. For example, she could use it to prevent small disasters or help in battles without others realizing how she's doing it at first.
Perhaps the Anbu daughter has a special bond with a tailed beast. Since Naruto has his own experience with the Nine - Tails, he takes an interest in her situation. She could be the key to a new form of power that combines human and tailed - beast chakra in a unique way. This might lead to her being targeted by enemies, and Naruto has to protect her while she learns to control this new power.
One idea could be Sasuke leading an Anbu mission while Naruto, as Hokage, has to deal with the political fallout of the mission's actions. For example, if the Anbu under Sasuke's command accidentally cross a border during a pursuit, Naruto has to smooth things over with the neighboring village.
Perhaps in the fanfiction, there's a prophecy that only Hokage Naruto and Anbu Sasuke can fulfill together. They have to embark on a dangerous journey outside the village to prevent a great disaster. Along the way, they face many challenges that test their friendship and skills. For instance, they might have to fight against ancient and powerful creatures. This would not only show their combat abilities but also how they support each other in difficult situations.
Another plot could be set after Naruto becomes Hokage. Itachi somehow returns or his past actions are re - examined in a new light. Naruto, as the Hokage, has to deal with the revelations about Itachi and how they impact the village's history and relationships. They might work together to heal old wounds and face new challenges that are related to the past secrets of the Uchiha clan.
One idea could be Naruto facing a new and powerful enemy that challenges the very foundation of the Hidden Leaf while he's Hokage. He has to use his unique leadership style and ninja skills to protect the village. Another could be Naruto implementing new training programs for the younger ninjas, based on his own experiences growing up.
One idea could be a story where Naruto has to face a new, powerful and mysterious enemy that has the ability to manipulate time. This would put his skills as a Hokage to the ultimate test.
One idea could be that she struggles with the pressure of living up to her father's legacy as Hokage. Maybe she has to deal with villains who target her specifically because of who her father is. Another could be her journey to discover her own unique ninja way that's different from her father's.
One idea could be exploring the character's past in the ANBU in more detail. For example, showing the difficult missions they had to undertake and how it shaped them.
One idea could be exploring Itachi's time in ANBU and how Naruto might have influenced his decisions secretly. Maybe Naruto, with his unique way of seeing people, could have made Itachi question his path in the ANBU more deeply.
Another plot could involve the Anbu team being tasked with protecting a young and powerful ninja from another village who has valuable knowledge. Along the way, they form an unexpected bond with this ninja and learn new techniques from them.
One idea could be that the blind Anbu has a special ability to sense chakra in a unique way. For example, they can detect the slightest change in an enemy's chakra, even if they can't see them physically. This gives them an edge in battle.