He could be portrayed through his appearance. For instance, one personality might have different - colored eyes or a distinct style of dressing. His behavior would also change. When in one personality, he could be very talkative and energetic, and when in the other, he could be silent and brooding.
The split - personality clones often add an element of unpredictability to the plot. Since each clone has its own unique way of thinking and acting, it's hard to predict what they will do next. This keeps the readers on their toes. For example, a clone with a very curious personality might stumble upon a secret that was supposed to be hidden, and this discovery can then drive the plot forward in unexpected ways. The clones can also act as a mirror to Naruto, highlighting his own personality traits through contrast or similarity, which in turn can affect the development of the overall story.
Well, in such fanfiction, the idea of the clones having different moral compasses due to their split personalities is really fascinating. Some clones might have a very strict sense of justice, while others could be more morally ambiguous. This can lead to all kinds of internal conflicts within the group of clones and also with Naruto himself.
One idea could be that Naruto's split personality represents his inner struggle between his desire for recognition and his fear of being alone. For example, one personality might be overly confident and outgoing, while the other is more reserved and introspective.
First, choose a character from RWBY. Let's say Yang. Decide what could trigger her split personality. It could be a traumatic event. Then, think about how her two personalities would be different. One could be more subdued and the other more fiery. Start writing by showing the initial signs of the split.
A possible plot is that Kurama's split personality actually has a soft side. This side of Kurama starts to merge with Naruto's kinder nature, creating a new personality within Naruto that is extremely empathetic. This new personality tries to find peaceful solutions to conflicts, which surprises both Naruto's friends and enemies. Another plot could be that Naruto's split personality caused by Kurama starts to have its own set of memories, memories that are related to Kurama's past and the ancient history of the ninja world, and Naruto has to figure out what these memories mean and how they can help him in his present situation.
Kurama is often depicted as mischievous in fanfiction. His powerful and somewhat arrogant personality leads him to play pranks on Naruto. He might think it's beneath him to be so closely tied to a human, so he uses pranks as a way to assert some sort of control or just to amuse himself.
Naruto might become more solitary. With the great power of Kurama, he may feel that he is different from others and that they can't understand what he's going through. This could lead to him spending more time alone, training to master his new power. But eventually, he would realize that he still needs his friends and their support, and he would come back to his more social self.
A great RWBY split personality fanfiction could involve Weiss. Her split personality might emerge due to the intense pressure she faces. Maybe one side of her is more rebellious against her family's expectations and the other is still trying to uphold her family's honor. This contrast can create a lot of internal conflict and engaging storylines.