Definitely Orihime. She is the type who would be easily attracted to Goku's pure - heartedness and his determination to protect. Her own insecurities might be soothed by Goku's confidence. Rukia, with her sense of duty, could find herself drawn to Goku's selfless acts of heroism. And Neliel could also be part of the harem. Her child - like form and yet powerful true form would create an interesting relationship with Goku, as he might be protective of her in her child form and respect her power in her true form.
One idea could be a story where Goku is transported to the Bleach universe and somehow ends up attracting a harem of female characters from Bleach. For example, Orihime could be intrigued by Goku's incredible strength and kind heart, and gradually develop feelings for him. Another could be that Goku saves Rukia from a powerful enemy in the Bleach world, and as a result, she and other female Soul Reapers start to follow Goku around, leading to a harem - like situation.
Rebecca could potentially be in Luffy's harem. After Luffy helped her in Dressrosa, she might develop feelings for him. She is a strong - willed and kind - hearted character. Another could be Shirahoshi. Luffy has a special connection with her as he saved her from being captured. Her gentle and innocent nature would contrast with some of the other more assertive members of the harem.
Well, Mirajane could be part of the harem. She has a motherly side and would want to comfort Natsu if he was betrayed. Levy is also smart and resourceful, and she could use her skills to help Natsu out. Juvia, with her obsessive love for Gray, might transfer some of that intense loyalty to Natsu if she saw him in a desperate situation after being betrayed.
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.
Another theme is the exploration of different cultures. Since Naruto and Bleach have their own unique cultures, the fanfic often delves into how these cultures interact when the characters are brought together. This can include things like how the ninja way from Naruto might be perceived by the Soul Reapers in Bleach, and how the hierarchies in both worlds are navigated in the context of the harem relationships.
A powerful demon from another dimension could be the main villain. This demon could be seeking to destroy all Saiyans and starts targeting Goku, Caulifla, and Kale. He has unique powers that they have never faced before, like the ability to nullify their energy attacks.
Orihime Inoue is often included in Ichigo's harem in fanfics. She has a pre - existing relationship with Ichigo in the original series, with her feelings for him being quite strong. Rukia Kuchiki is another common character. Her connection with Ichigo is deep, as she was the one who initially transferred her powers to him. Then there's Tatsuki Arisawa, who is Ichigo's childhood friend. In some fanfics, her relationship with Ichigo takes on a more romantic turn within the context of the harem. And Neliel Tu Odelschwanck could also be part of the harem. She has a unique bond with Ichigo, and her character's personality makes her an interesting addition to the harem concept.
Well, 'The Harem of Ichigo in Bleach' is also a great one. It delves into how Ichigo deals with the different personalities in his harem. Each character in the harem has their own backstory and motives, which makes the story complex and interesting. There are also some really cool action scenes that are intertwined with the relationship building.
Well, characters like Nightcrawler could be part of it. His acrobatic and teleporting abilities would add an interesting dynamic to the harem. Another could be Iceman. His cool (pun intended) powers and his somewhat reserved personality could create an interesting relationship with Superboy. And then there's Cyclops, with his leadership skills and powerful optic blasts. He could also be a likely candidate for the harem.
Tuxedo Mask could also be in the harem. He has a long - standing relationship with Usagi, and in a harem scenario, his feelings for her could be even more intense, competing with others for her love.