Well, Naruto and Tsunami are the core. But don't forget about Shikamaru. He's a smart character and if added to the harem in some creative way, it could lead to some really interesting stories. Also, Kiba might be included. His energetic and somewhat brash personality could add a lot of humor and conflict to the relationships in the harem. And of course, there could be other minor characters from the Naruto world who could be brought in to spice things up.
Obviously Naruto would be one of the main characters. And among the Hollow harem, there might be some well - known Hollow characters like Orihime Inoue (who has Hollow - like powers in the original series) or other original Hollow characters created specifically for the fanfiction.
Sakura is often a likely candidate. She has a long - standing relationship with Naruto in the original series, so it's easy to imagine her in a harem scenario with him.
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.
Tenten could be another character included. She is a strong female ninja. In the fanfiction, she might bring her own unique charm and skills to the harem, perhaps competing with the other girls in a friendly or not - so - friendly way to get closer to Naruto.
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.
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.
Well, Moka would be a likely candidate. She's the main female character in Rosario Vampire and her kind yet strong - willed nature could be attracted to Naruto's positive traits. Inner Moka might also be interested in his power. Tsukune's female friends like Kurumu and Mizore could also be part of the harem. Kurumu is very flirtatious and might see Naruto as an interesting new addition, and Mizore, with her cold exterior but warm heart, could gradually fall for Naruto as they interact more.
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.
Naruto himself is obviously a key character in this type of fanfiction. Then there's Sasuke. Given his popularity and complex personality, he can add a lot of drama to the harem situation. Shikamaru is also likely to be part of it. His laid - back but intelligent nature can create interesting interactions with Fem Haku. Another one could be Gaara. His past and his new - found path of friendship could lead to him having feelings for Fem Haku in the fanfiction.
The other girls who might be part of the main characters in this fanfiction could be Ukyo. She has her own feelings for Ranma and her unique personality and skills as a chef would add a lot to the story. Also, Shampoo would be a main character. Her Amazonian background and her tenacity in pursuing Ranma would make her an important part of the harem dynamic.