The main character is Naruto, no doubt. As for the harem part, it could include a diverse range of characters. There could be the kunoichi from his own village like Ino, who might be part of the harem. Then there could be characters from other villages as well. Maybe a female shinobi from the Sand Village like Temari could also be involved. And don't forget about some of the minor female characters in the Naruto world who could be added to the harem in this fanfic, which would then make them main characters in the context of this particular story.
Since it's a Naruto - based fanfic, Naruto would likely be one of the main characters. And probably some female characters from the Naruto series like Sakura, Hinata, or other female ninjas could be part of the harem and thus main characters in this fanfic as well.
In 'naruto's hypnotic harem fanfic', Naruto is surely a main character. In addition to him, depending on how the author writes it, it could be that some of his friends or allies are involved. For example, Tenten might be one of the characters in the harem. Also, some of the antagonists' female subordinates could also be part of the harem. So characters like Anko might also be main characters in this particular fanfic, but it really depends on the creativity of the fanfic writer.
I'm not entirely sure about the specific plot of this fanfic as there could be many different interpretations. But generally, in a 'hypnotic harem' type of fanfic, it might involve Naruto using some form of hypnosis to gain the affections or control of a group of characters, usually female characters. However, this is just speculation based on the title.
Some fanfictions may include characters from other villages as well. For instance, Karin from the Hidden Mist Village could be part of the harem. And the Sage of Six Paths might be mentioned or even play a role in a more complex and elaborate fanfiction plot. Also, characters like Jiraiya could have an influence on Naruto's approach to managing his harem, given Jiraiya's own experiences with women.
In a 'naruto is in a au harem fanfic', aside from the obvious choices like Sakura and Hinata, characters like Temari could be in Naruto's harem. She's from another village and has a strong personality. Her presence would bring in an element of cross - village relations. Karui is also a possibility. She's feisty and has her own set of skills. And then there's Kurenai, the jonin. She could be an interesting addition to the harem, with her experience and calm demeanor.
Main characters in naruto demon harem fanfic are Naruto, who is in the middle of all the action. Female characters such as Temari from the Sand Village might also be included. And the demon, which is what makes it a 'demon harem' fanfic. The demon might have its own motives and goals, which often clash with Naruto's. The female characters are caught in between, having their own feelings for Naruto and being affected by the presence of the demon. This complex web of relationships is what drives the story forward.
Obviously Naruto would be one of the main characters. And most likely, some of the female characters from the Naruto series such as Sakura, Hinata, and Tenten. Since it's a harem fanfic, they would be the ones involved in the potential romantic relationships with Naruto.
Typically, characters like Sakura could be one of the main female characters. She is strong - willed and her presence in a hypno - harem situation could add a lot of drama. Another could be Hinata, with her shy yet determined personality. Her relationship with Naruto in the context of a harem would be interesting to explore.
The main character could be an original character with a special doujutsu. For the harem part, characters like Sakura, Hinata, and Ino could be part of it. Sakura with her strong medical and combat skills, Hinata with her gentle yet powerful Byakugan abilities, and Ino with her mind - control jutsu would make for an interesting dynamic around the main character with the doujutsu.
One of the popular characters is Hinata from Naruto itself. Since she already has feelings for Naruto in the original series, she is often part of the harem in crossover fanfics too. From other series, Lucy from Fairy Tail is also common. Her magical abilities and her kind - hearted nature can blend well with Naruto's character. Additionally, Saber from Fate/stay night is often included. Her noble and powerful presence can add a different flavor to Naruto's harem.
Hinata is also often included. Given her long - standing crush on Naruto in the official story, it's easy for fanfic writers to develop their relationship into a full - fledged romantic one in a harem scenario.
Obviously Naruto would be one of the main characters. And then there could be female Pokemon like Pikachu's female form (if we consider that in the fanfic), and female trainers such as a character inspired by Dawn from the Pokemon series. They would be the main parts of the harem, attracted to Naruto in different ways.