One common plotline is the fem yandere character becoming obsessed with Naruto and trying to eliminate any potential rivals for his affection. For example, she might see Sakura as a threat and start plotting against her in devious ways.
Another plot could be the fem yandere using her 'yandere' tendencies to protect Naruto from perceived threats. She might go to extreme lengths, like spying on other characters she suspects of having ill intentions towards Naruto. This can create a lot of drama and tension in the fanfic as Naruto may or may not be aware of her actions.
The development should also include how she interacts with other characters. Her yandere behavior might not be obvious to everyone at first. She could be sweet and friendly on the surface, but there are little signs that something is off, like the way she clenches her fists when Naruto talks to another girl or how she subtly tries to isolate Naruto from his friends over time.
One common trope is the intense jealousy of the yandere Fem Sasuke. She might get jealous over Naruto's interactions with other characters, even if they're just friendly. Another trope could be her overprotectiveness. For example, she'd go to great lengths to keep Naruto safe from any perceived threats. Also, there's often a lot of internal conflict within Naruto as he tries to deal with this new, intense version of Sasuke. He might be attracted to her in some ways but also be a bit afraid of her extreme behavior.
One possible plotline could be the yandere fem Kyuubi constantly trying to protect Naruto in overly possessive ways. For example, she might scare off any potential rivals for Naruto's attention, even his friends at times. Another could be Naruto initially being oblivious to her yandere tendencies and just seeing her as a strange but powerful ally. As the story progresses, he has to deal with the consequences of her extreme behavior.
There's also 'Fem Naruto's Adventure'. This fanfic often delves into how fem Naruto's character traits, which are a blend of Naruto's original ones but with a feminine touch, interact with Naruto himself. It could show unique storylines like how they face challenges together in a new light.
One possible plotline could be that fem Kurama helps Naruto master new forms of his chakra more quickly. Another could be them going on a journey together to discover more about Kurama's past. Or perhaps they team up to fight a new, powerful enemy that threatens the Hidden Leaf Village.
One popular plot idea could be Naruto gradually forming a bond with the fem Kyuubi. As he does so, he attracts a harem of characters who are intrigued by this unique relationship. For example, some might be drawn to his newfound power or the mystery around his connection with the Kyuubi. Another idea could be that the fem Kyuubi has to protect Naruto from those who would seek to use or harm him because of their relationship, and in the process, they both gain more allies that form the harem.
Another theme could be redemption. If fem Itachi has done some wrong in the past, Naruto might be the one to help her find redemption. It's a way to explore the characters' moral compasses. Also, there could be a theme of discovery. As they interact, they might discover new things about themselves and the world around them.
At first, Naruto might be completely oblivious to the yandere Fem Sasuke's feelings. But as she starts to show her possessiveness more openly, he'll have to face it. This could lead to some arguments between them. However, over time, Naruto could start to see the good in her. He might realize that her love, although extreme, is genuine. And so, they could start to build a more trusting relationship. For example, she could open up to him about her past and why she's so protective, which would bring them closer.
A third plotline could be that Fem Zabuza is a time - traveler. She travels back in time and meets a young Naruto. She decides to train him, seeing his potential. As they train together, a bond forms between them. But her presence in the past also starts to change the future in unexpected ways, and they have to deal with the consequences while also exploring their relationship.
One possible plotline could be that the fem Genji is from a different world and somehow gets transported to the Naruto universe. There, she meets Naruto and they team up to face a common enemy.