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.
There could also be characters like Kodachi. Her somewhat crazy and obsessive love for Ranma could bring a lot of drama to the 'Ranma Marries Harem' scenario. And don't forget about Kasumi, who, while more reserved, could play a role in providing stability and a different perspective within the chaotic harem situation.
Obviously, Percy is one of the main characters. And then there's the primordial that he marries. There could also be Percy's friends like Annabeth who might play important roles. They could be either supportive or skeptical of Percy's relationship with the primordial.
Obviously, Percy and Hera are the main characters. Percy, the demigod hero, and Hera, the queen of the gods.
Obviously, Percy and Gaea would be the main characters. But there could also be other characters like Annabeth. She might be heartbroken at first when she hears about Percy's marriage to Gaea. And then there could be some of the other demigods like Jason or Piper who would be involved in trying to understand what's going on and maybe even stop it if they think it's a bad thing.
One possible interesting plot could be how Ranma manages to balance his relationships with different characters in the harem. For example, he might have to deal with the different personalities and needs of each girl, like Akane's fiery temper and others' more gentle natures.
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.
Harry Potter would likely be one of the main characters. Since Ginny is his love interest in the original series, he would surely be affected by her marriage to Voldemort. He might be the one to try and rescue her or stop the marriage. Ron Weasley, Ginny's brother, would also be important. He would be outraged and would probably be part of any plan to oppose the union.
Well, Mumen Rider could potentially be in a comical sense in a One Punch Man harem fanfiction. Just kidding! But seriously, characters like Fubuki are prime candidates. She has a strong personality and her own motives which could easily be intertwined with romantic feelings for Saitama. Also, any new female characters introduced to the One Punch Man universe in the fanfiction could be part of the harem. They might be normal civilians who witness Saitama's heroics up close and become smitten.
Well, Ned Stark is a given. For the Targaryen side, it could be a Targaryen who has lived in Essos and has different views from the main Targaryen line we know in the books/show. This character could be more open to the ways of the North. Or it could be a young Targaryen heir who Ned Stark marries to strengthen an alliance between the North and any remaining Targaryen supporters. This character might be inexperienced in the ways of Westeros politics and Ned would have to guide her.
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.
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.