Well, a plot could revolve around a misunderstanding. Lee's sister accidentally uses a jutsu that Neji mistakes for an attack on his clan. He confronts her, but as they talk it out, they discover they both have a lot in common in terms of their views on the ninja world. This starts their relationship. Or maybe there's a prophecy about a union between a member of Lee's family and a Hyuga, and they are unknowingly the ones in the prophecy. As they try to figure out if it's true, they develop feelings for each other.
One idea could be that Lee's sister is a skilled kunoichi who catches Neji's eye during a joint mission. They start off as sparring partners, gradually realizing their mutual respect is turning into something more. Another plot could involve Neji helping Lee's sister overcome a personal struggle, like mastering a new jutsu, and in the process, they fall in love. Or perhaps in a time - travel fanfiction, she goes back in time and meets a younger Neji, changing the course of their relationship in unexpected ways.
One plot idea could be a story where Neji, despite his initial doubts, trains Hinata intensively to become a stronger ninja. This could involve them going on a journey to a special training ground and facing various challenges together.
One idea could be that Neji discovers a new hidden power within Naruto that he helps Naruto master. This could lead to them having to face a new, powerful enemy together.
One possible plotline could be that Lee's sister, who might be a kunoichi in training, catches Neji's eye during a sparring session. Neji, initially reserved, starts to become more interested in her as he sees her determination and unique fighting style. They could then start to train together secretly, and their relationship slowly blossoms into a deep friendship with a hint of something more romantic as they face various challenges in the ninja world.
Lee's sister might be energetic and full of life like her brother. This could contrast well with Neji's more stoic and serious nature. Her positive energy could start to break down Neji's walls. Neji, on the other hand, is highly disciplined and intelligent. He could help her focus her energy in a more strategic way in battles and in life in general.
A third plot could revolve around a mission where Naruto, Sakura, and Neji are the only ones available. They are sent to a mysterious land filled with strange creatures and a powerful enemy. Neji uses his Byakugan to analyze the enemy's weak points. Sakura heals them during the battles. Naruto, of course, is the one who ultimately faces the main villain, with the support of his friends.
Realistically, it could start with simple interactions. For example, they might be assigned to the same team for a mission. At first, they have different ways of approaching the mission, but they learn from each other. Neji's calm and calculated nature could balance out Lee's sister's more impulsive side. As they face challenges during the mission, like fighting strong opponents or dealing with difficult terrains, they start to rely on each other more, and that's how the relationship could begin to develop.
Perhaps in the fanfiction, as brothers, they have to face a common enemy that is specifically targeting their family line. This would make them rely on each other's unique abilities. Naruto's never - give - up attitude combined with Neji's precision could lead to some epic battles.
One idea could be a crossover with the Naruto and Bleach universes. Neji could be sent to the Soul Society by some strange jutsu gone wrong. There, he might learn new spiritual powers and fight Hollows. Another plot could be a crossover with the Harry Potter world. Neji arrives at Hogwarts and his unique abilities in chakra control could be seen as a form of magic. He could interact with the students and teachers, and perhaps even get involved in the fight against Voldemort. A third plot might involve a crossover with the Avatar: The Last Airbender world. Neji could find himself in the Four Nations and have to adapt to bending and non - bending cultures while also using his Byakugan and Gentle Fist techniques.
One idea could be a story where Neji and Tenten go on a special mission together. They face many challenges and in the process, Neji discovers a new side of Tenten's strength. Maybe she uses some unique weapons or techniques that Neji has never seen before, and he gains a new respect for her.
A great plot twist could be that Neji, who was thought to be a loyal Leaf Village ninja, is actually a spy for an enemy village. This would completely change the dynamics between him, Naruto and Sasuke. They would have to figure out how to deal with this betrayal while also dealing with other threats to the village.