Definitely Naruto and his sister. As for the harem, Anko Mitarashi could be an interesting addition. Her wild and free - spirited nature could be intrigued by Naruto's unique personality. Kurenai Yuhi could also be part of it. Maybe she sees Naruto as a new hope for the future and her feelings gradually turn romantic. And let's not forget about Shizune. Her loyalty and kind nature could make her develop feelings for Naruto, especially with his sister being in the mix as a way to bring them closer.
Well, obviously Naruto himself would be a main character. His sister could be an original character created just for the fanfiction. In terms of the harem members, Sakura could be one. Even though she has feelings for Sasuke in the original series, in this fanfic she could see Naruto in a new light. Hinata is also a likely candidate as she already has deep feelings for Naruto. Another could be Ino, who might be drawn to Naruto's growth and newfound confidence in this alternate scenario.
Definitely Hinata. She already has strong feelings for Naruto in the original Naruto series. Sakura could also be part of it as she has a long - standing relationship with Naruto. From other series, if we're doing a crossover, Erza from Fairy Tail could be an interesting addition. She's strong, independent, and would make for an interesting dynamic in a harem situation with Naruto. Also, Rukia from Bleach could be another. She has a cool and collected personality which would contrast with Naruto's more exuberant nature.
Definitely Naruto and the fem Kyuubi. Tenten could be part of the harem. She is a strong - willed kunoichi. Temari from the Sand Village could also be included. She has interacted with Naruto before and her feisty nature would make for an interesting addition to the harem. And of course, there could be some original characters created just for this fanfiction.
In addition to the obvious ones like Sakura and Hinata, Ino could also be part of the 'naruto x yugito harem'. Ino has always been competitive with Sakura over Sasuke, but in this fanfiction scenario, she might see Naruto in a new light and be drawn to him. Tsunade could also be an interesting addition. She is a powerful and experienced ninja, and her relationship with Naruto as his mentor could potentially take on a different, more romantic - ish turn in the context of a harem fanfiction.
There could also be some original female characters created specifically for the fanfiction. Maybe a female fire - bender who has a secret past and sees something in Naruto that makes her want to open up. She could be part of the harem, adding her own unique story and relationship with Naruto to the mix.
Well, Wonder Woman is an obvious choice. Her strong - willed and noble nature would be an interesting contrast to Naruto's more free - spirited ninja self. Another could be Zatanna, with her magic abilities. She might be curious about Naruto's chakra - based techniques which are somewhat similar to magic in a way. And then there's Starfire, whose alien nature and exuberant personality could lead to some fun interactions with Naruto.
In the Avatar world, Katara could be one of the potential characters. She is strong - willed and caring, and might be attracted to Naruto's determination. Toph could also be a part of it. Her tough - as - nails attitude might find Naruto's unique powers interesting.
Sakura would be an obvious choice. She has a long - standing relationship with Naruto in the original series. Hinata is also a likely candidate, given her feelings for Naruto. Then there are other strong female characters like Temari. She's tough and could add an interesting dynamic to the harem.
There could be some original Arrancar characters created specifically for the fanfiction. For example, a young and curious Arrancar who is new to the ways of her kind. She meets Naruto and is immediately fascinated by his different appearance and abilities. And then there's a more experienced Arrancar who has seen many battles. She initially sees Naruto as a threat but then realizes his good intentions and slowly falls for him, becoming part of the harem.
Naruto is a given in this fanfiction. In Kumogakure, Mabui could be part of the harem. She is intelligent and in charge of a lot of important operations in the village. Her relationship with Naruto could start from her helping him with some village - related tasks. Another potential character is Omoi. Although he is male, his interactions with Naruto could lead to the female characters around him taking more of an interest in Naruto, thus contributing to the harem idea.
Sakura could be a potential character. She has a long - standing relationship with Naruto, and in this harem scenario, she might be jealous of Naruko at first but then come to accept the situation. Hinata could also be part of it. Given her love for Naruto, she would be an interesting addition to the harem, adding a shy and gentle dynamic.