One idea could be exploring Kakashi's relationships within the Anbu. For example, his friendships or rivalries with other members. Maybe there was a particular mission where he had to rely on a teammate he didn't trust at first.
A fun plot could be a time - travel fanfiction where Kakashi is sent back to his Anbu days with the knowledge he has now. He could use this knowledge to change certain events, like saving a fellow Anbu member who died on a previous mission, or preventing a political intrigue within the Anbu that had far - reaching consequences.
Another plot could be about Kakashi's struggle with the darker aspects of Anbu work. He's a complex character, and showing how he copes with the morally gray areas of assassination and espionage in the Anbu would be fascinating. It could involve him having to make a tough choice between following orders and his own sense of right and wrong.
Perhaps a story where Kakashi's past Anbu experiences resurface during a mission with Naruto in the Anbu. They have to deal with an old enemy that Kakashi thought was long gone, and Naruto helps him come to terms with his past traumas.
One idea could be that Sakura and Kakashi are on an Anbu mission together and they encounter a powerful enemy that requires them to combine their skills in new and unexpected ways. For example, Sakura's medical ninjutsu could be used not just for healing but also to enhance Kakashi's Sharingan abilities temporarily.
One idea could be that Naruto joins the ANBU under Kakashi's strict training. He struggles to adapt to the ANBU's stealthy and often morally gray missions at first. For example, he might be conflicted when ordered to spy on a former ally. But with Kakashi's guidance, he learns to balance his ninja ideals with the demands of the ANBU.
One idea could be that Sakura, as an Anbu, travels back in time and tries to prevent certain tragedies in Kakashi's past. Maybe she stops Obito from 'dying' initially, which would change the entire Naruto storyline in a major way.
A plot could involve Sakura getting caught in a political intrigue within the Anbu that Itachi is also a part of. Itachi tries to keep Sakura out of it, but she's determined to uncover the truth. This leads to a series of events where they have to rely on each other's strengths and overcome their own weaknesses.
One idea could be that the prodigy Anbu member has a unique ability that no one else in the Anbu has. For example, they can control the elements in a way that's different from normal ninja skills. This could lead to a plot where they are hunted by enemies who want to use this power for evil. Another idea is that the prodigy is secretly related to a major Naruto character, like Naruto himself, and this connection is gradually revealed as they face different challenges in the Anbu.
One interesting plot idea could be that Naruto, while on an Anbu mission, has to protect Ayame. Maybe there's a group of rogue ninjas targeting the local businesses in Konoha, including Ayame's ramen shop. Naruto uses his Anbu skills, which are more stealthy and deadly than his normal abilities, to keep her safe. Along the way, Ayame discovers a new side of Naruto she never knew, and they start to develop a deeper bond.
One idea could be that Sakura discovers a long - hidden Anbu mission related to her family. She then decides to join the Anbu to uncover the truth. Another could be that the Anbu has a secret training method that only Sakura can master due to her unique medical and combat skills. And perhaps there is a secret Anbu agent who has been secretly protecting Sakura all along, and she finally finds out.
One idea could be that Naruto and Sasuke are assigned a top - secret ANBU mission together to infiltrate a hidden enemy base. They have to rely on their unique skills and their new - found understanding of each other as ANBU operatives. Another could be that they are both part of an elite ANBU squad and have to deal with a powerful rogue ninja who has ties to their past.
One idea could be Naruto going on an Anbu mission where Hinata secretly follows him to protect him. Another could be an alternate universe where Naruto and Hinata are both in the Anbu and they have to work together to solve a mystery within the Hidden Leaf. Or perhaps a story where Naruto is in the Anbu and Hinata is trying to get his attention in a more covert way than usual.