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 could be one of the likely characters. She has a long - standing relationship with Naruto in the original series. In a fanfic with this concept, she might be drawn to Naruto's new connection with the fem Kyuubi out of curiosity or her own feelings for Naruto evolving. Hinata is also a strong candidate. Given her long - held feelings for Naruto, she would likely be part of the harem, especially as Naruto's power grows with the fem Kyuubi. And Ino could be there too. She's competitive and might see Naruto's new situation as something interesting and want to be part of it.
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.
The main character is Naruto. Among the Kara members, Eida is very likely to be in the story as she can create a lot of relationship - based drama with her power. Delta is another one, given her strong and somewhat brash personality. Amado, the former Kara member, could also be involved in some way, perhaps as a guide or an informant for Naruto within the Kara - related plot. And the other Kara operatives could also make appearances and potentially be part of the harem - like relationships around Naruto.
Sakura would be a likely character. She has a long - standing relationship with Naruto in the original series, so it's easy to imagine her in a harem - type situation with him.
Oracle, or Barbara Gordon. She has a deep connection to Batman, having worked with him in the past. Her intelligence and tech - savvy skills could add an interesting dynamic to the harem. She can be both a source of support and an independent force within the group.
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.
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.
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.
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.