Danny himself could potentially be part of the OC's harem. If the OC has a different perspective on being a half - ghost or some special knowledge that could help Danny better understand his powers or deal with his ghost - hunting duties, Danny might develop feelings for the OC. Then there are the other minor human characters in the show. For example, the cheerleaders. One of them might be attracted to the OC's charm or athletic abilities if the OC has any. And among the ghosts, there's Spectra. She's always interested in new and interesting things, and an OC with unique psychic abilities or a complex personality could draw her in.
Sam could be a potential member. She's strong - willed and has a passion for the environment. If the OC shares similar values or has an ability related to nature, Sam might be attracted to them. Tucker could also be part of it in a more platonic way. He might be intrigued by the OC's tech - savvy nature or unique gadgets. And of course, there are the various ghosts like Ember. Ember is a sassy and powerful ghost. If the OC has some musical talent or a connection to the world of emotions like she does, she could be drawn to the OC.
Jazz could be a member of the harem. She's intelligent and caring. If the OC has a deep understanding of psychology or is also academically inclined, Jazz might form a connection with them. Another potential member could be Valerie. She's a tough ghost hunter. If the OC has some sort of ability that can help her in her hunting or shows her a different side of the ghost world, she could be attracted to the OC. And from the ghost side, Youngblood could be interested in the OC if the OC has a playful side or a sense of adventure that matches his own.
Well, for the Danny Phantom side, Sam and Tucker could be involved. Sam might be jealous at first when other girls start showing interest in Danny. Tucker could be the one giving Danny advice on how to handle the harem situation. From other shows, if it's a crossover with a magical girl anime, characters like Sailor Moon could be part of the harem. Her kind and powerful nature would make an interesting dynamic with Danny. Another could be Kim Possible. She's a strong and capable girl who would likely be intrigued by Danny's powers and get involved in his adventures, and potentially develop feelings for him.
Fleur Delacour could be part of the harem. She is beautiful and confident. An OC who shows great courage and skill, perhaps in the Triwizard Tournament, could catch her eye. Then there's Cho Chang. If the OC has a sensitive side and an understanding of her past experiences, she might be interested. Also, Padma Patil. If the OC has an interest in different cultures of magic, as Padma comes from a different cultural background within the wizarding world, she could be attracted to the OC.
Definitely Miu could be one. She's a strong and kind character in the series. Shigure is also a likely candidate as she has her own charm. Then there's Renka, who is feisty and could be attracted to an interesting OC. And perhaps some of the other female students at the dojo who see the unique qualities of the OC and become part of the harem.
Liu Kang is also a possibility. In some fanfiction scenarios, the gender roles can be a bit more fluid. His noble and powerful presence could be part of the harem. Then there's Scorpion. His loyalty and intensity could make him an interesting addition to the harem around the OC. There could be a lot of drama with his vendetta-filled past.
Sam and Tucker would definitely be his top allies. They've been with Danny through his whole journey as a half - ghost, and they'd support him in his new role as the Master of Death. Sam could offer her unique perspective on the moral and ethical side of things, while Tucker could use his tech skills to help Danny understand any new powers or situations related to his new title.
Potential members could include Tenten from Naruto's world. She might be interested in Naruto's adventures in a different universe and become part of the harem. In Starfire's world, there could be a scientist - type character who is fascinated by Naruto's ninja abilities and the concept of chakra. This character could start to develop feelings for Naruto as she studies him more closely, thus joining the harem.
Sakura could be a potential member. She has a long - standing relationship with Naruto and her skills as a medical ninja could be an asset to the group. Ino might also be part of it. Her mind - control jutsu and her strong personality could add an interesting dynamic. Tenten could be there too, with her weapon expertise. These characters already have connections to Naruto in the original story, and in a harem fanfiction, they could form a unique relationship with both Naruto and Kurenai.
Sakura could be a potential member. She has always had a connection with Naruto, and in this harem scenario, her feelings could develop further in a different way. Also, Hinata, with her long - standing love for Naruto, might be part of it.
Sakura could be a potential member. She's strong - willed and has her own set of skills. Hinata is also a possibility as she is kind and has always had feelings for Naruto. Ino could be in the harem too with her mind - related abilities. And Tenten, with her weapon skills, might also be an interesting addition.
In such a fanfiction, Lightning could be a likely member of the harem. She is strong - willed and a capable fighter in Final Fantasy 13. Her no - nonsense attitude might be softened by Naruto's positive and energetic nature. Serah could also be part of it. She has a kind heart and might be drawn to Naruto's heroism. Fang, with her bold and adventurous spirit, would find Naruto's own sense of adventure appealing. Vanille, with her sweet and somewhat naive personality, could also be attracted to Naruto and become part of the harem.