The main character is Naruto. For the harem, Hinata is almost a given as she has strong feelings for Naruto. Sakura could be included as she has a complex relationship with Naruto. Then there are other possibilities like Karin. She has shown an interest in Naruto in the original story. Also, some original female characters created specifically for the fanfiction might be part of the harem. They could be designed to have unique abilities and relationships with Naruto, adding more depth and variety to the story.
Definitely Naruto is the central figure. In the harem, Hinata is a very likely character since she has always been in love with Naruto. Sakura might also be there as she has been one of Naruto's closest friends. Tenten could be another addition. She has interacted with Naruto in the series and could potentially be part of the harem in this fanfiction. Also, Temari, who has had some interesting encounters with Naruto, might be a character in the harem as well.
Hinata could also be a common character. She may try to help Naruto secretly, or be heartbroken by his banishment and strive to change the village's decision. Another character could be Kakashi. He might be one of the few who believe in Naruto's innocence and try to find a way to bring him back to the village.
Sasuke could be a likely character in some fanfiction. Maybe in an alternate universe where their rivalry takes a darker turn, Sasuke might frame Naruto to gain an advantage or to prove his own superiority. It would add a whole new dimension to their relationship.
The village elders could be antagonists. They might see Naruto and Kakashi as threats to their traditional way of ruling the village and use false accusations to banish them.
Well, in this type of fanfiction, a common plotline is that Naruto's banishment is a setup by some hidden enemy. The harem girls, who truly believe in Naruto, then work together to expose the real culprit. They might use their different skills and knowledge to gather evidence. For example, one girl could be good at spying and another at deciphering codes. As for Naruto, he might struggle with self - doubt at first but then regain his confidence with the support of the harem.
Obviously Naruto himself is the main character involved. But his friends like Sasuke, Sakura, and Kakashi are also likely to be involved. Sasuke might be affected by Naruto's wishes, for example, if Naruto wishes for Sasuke to fully return to the Hidden Leaf Village and be at peace. Sakura could also be involved, perhaps in helping Naruto make his wishes come true in a medical or support way. And Kakashi, as Naruto's former teacher, would surely play a role in guiding Naruto in how to use his wishes wisely.
Obviously, Naruto is the central character. But other characters like Sasuke could also be involved. Sasuke might be torn between his loyalty to Konoha and his friendship with Naruto. He could either try to bring Naruto back or join him in his exile.
Definitely Iruka. He has seen Naruto grow up and has always supported him. Then there's Shikamaru. He's smart and he can see Naruto's value. He might support Naruto even if it goes against the village's decision at first. And of course, Kakashi. He has mentored Naruto and knows his potential, so he could be in Naruto's corner in these fanfictions.
Sasuke would likely be involved. He has his own issues with Konoha and might side with Naruto, either out of friendship or his own vendetta against the village. Also, the elders of Konoha like Danzo could be important characters as they might be the ones behind Naruto's banishment.
Sakura could be a popular choice in the harem. Even though in the original series she had a different relationship with Naruto, in this fanfiction genre, she could be part of his harem. Hinata is also likely to be included as she has always had strong feelings for Naruto. And Tenten might be another character, adding an interesting dynamic to the harem with her weapon skills.
Sakura could be one of the characters. Since she has a long - standing relationship with Naruto in the original series, in a harem fanfiction, she might be part of it. Another one could be Hinata. She has always had deep feelings for Naruto, so it's likely for her to be included. And of course, Tenten herself is a central part of this harem concept in the fanfiction.