In this fanfiction, perhaps Kakashi and Tobi meet in a battle. Kakashi might initially be suspicious of Tobi's true identity. Tobi could be playing mind games with Kakashi, trying to throw him off his game.
One possible plot could be that Tobi kidnaps Kakashi to gain some valuable information. Maybe he wants to know about the Sharingan secrets Kakashi has. Tobi could hold Kakashi in a secret lair and try to interrogate him.
Kakashi could become more distrustful after meeting Tobi. Since Tobi is such a mysterious figure, Kakashi might start to suspect everyone around him more.
One possible plot could be that Tobi, Sakura, and the female reader all end up on a mission together. Tobi's unpredictable nature might create some comical situations at first. Sakura, with her medical and combat skills, would be a reliable ally. And the female reader could have some unique abilities that help them overcome the challenges in the mission, like perhaps the ability to communicate with animals which gives them an edge in a forest - type mission.
Well, it could be about Kakashi finally finding Obito after a long search. Maybe Obito has changed a great deal, and Kakashi has to come to terms with this new version of his old friend. They might have a battle first due to their different paths, but then they start to talk and remember their past together, like their time as teammates in Team Minato.
It could be that Takashi is a new recruit in a ninja - like organization where Kakashi is a trainer. At first, Takashi struggles to meet Kakashi's high standards, but with determination and Kakashi's guidance, Takashi improves. Their relationship develops from a strict teacher - student one to a more friendly and mutual - respect - based bond.
Well, it could be about Team Minato coming across Kakashi during a difficult mission. Maybe they find him in a tough spot and have to rescue him, and then they all work together to complete the mission that Kakashi was initially on alone.
One possible plot could be that Kakashi, while on a mission in a mysterious forest, stumbles upon a strange and powerful force. As he investigates, he is suddenly transported to a different realm where he meets his mother. His mother reveals secrets about his family's past and the origin of his Sharingan. Then they have an emotional conversation about how much she missed seeing him grow up.
One possible plot could be that Team 7 stumbles upon a young Kakashi during a time - travel mission. They might initially be shocked to see their sensei as a young boy. Naruto, being Naruto, would probably be super excited and try to befriend young Kakashi right away. Sasuke might be more reserved but also curious about this version of Kakashi. Sakura could be in awe and try to take care of him in a way, seeing as he's just a kid. They could end up having to protect young Kakashi from some sort of danger in the past while also learning valuable lessons about their own sensei's past.
One possible plot could be that they meet during a time - travel incident. Obi - Wan from the Star Wars universe and Kakashi from the Naruto universe find themselves in a neutral dimension. They initially see each other as threats but then realize they have a lot in common as both are highly skilled warriors and mentors. They then team up to find a way back home.
Naruto would probably be one of the first to try and rescue Kakashi. He has a strong bond with Kakashi and would not stand by while his teacher is in danger.