One of the most interesting characters in yugioh harem fanfic is Bakura. His dark side and the mystery surrounding him can add an air of intrigue to the harem. Also, Ishizu Ishtar has a certain allure. Her knowledge of the ancient past and her calm, collected nature can make her a very engaging character in the harem. And let's not forget about Rex Raptor. His love for dinosaurs and his unique personality can bring a different flavor to the relationships within the harem, whether it's through friendly rivalries or potential romances.
In yugioh harem fanfic, Seto Kaiba is often an interesting character. His pride and power make him a force to be reckoned with, and his relationship with the main character in a harem setting can be full of tension and competition. Mai Valentine is also a great addition. Her confidence and beauty can create interesting dynamics within the harem, especially when it comes to vying for the main character's attention. Another one is Tristan. His loyalty to his friends can play an important role in the harem story, for example, in protecting the main character from any threats.
Seto Kaiba and Gary Oak would make for a fascinating pair in a crossover fanfic. Kaiba's arrogance and Gary's self - assuredness could lead to some intense rivalries. They might compete to see who can be the best in both the Yugioh and Pokemon worlds. Another interesting character would be Serena. Her kind - hearted nature could be a contrast to some of the more intense Yugioh characters. She could form bonds with the Duel Monsters in a different way than the other characters, perhaps using her compassion to calm down some of the more aggressive ones.
The lamia characters can be really interesting. They have a snake - like lower body which gives them a unique physical appearance and movement. Their personalities can range from sly and cunning to gentle and loving, which makes for a great addition to the harem dynamics.
Jack Atlas is really interesting. His over - the - top personality and his journey from being a satellite kid to a famous duelist provide a lot of material. You can write about his inner struggles, like his pride and how it sometimes gets in the way of his relationships. Another great character is Aki Izinski. Her dark past as a Dark Signer and her struggle to overcome that and become a better person can be really engaging to write about.
In the Naruto world, Sakura could be a potential character in the harem. She's strong - willed and has her own set of skills. From the Yugioh world, Anzu could be part of it. She's kind - hearted and often supports the main characters. Another from Naruto could be Hinata, who is shy but also very loyal. And from Yugioh, Mai Valentine, as she has a bold and confident personality.
The most interesting aspect is the crossover of different power systems. Naruto has his chakra and ninja techniques, while Yu - Gi - Oh has the power of the cards. Seeing how these two interact, like Naruto using a card - based power boost or Yu - Gi - Oh characters being affected by ninja magic, is really cool.
Yugi Moto is always an interesting character to feature. His connection with the Millennium Puzzle and his unique dueling style could be explored further in the context of time - traveling adventures. He could use his ancient Egyptian knowledge to solve time - related mysteries.
Kuroyukihime is always an interesting character. Her strong and mysterious nature makes her stand out in the harem. Then there's Chiyuri, with her bubbly and friendly personality that adds a different dynamic.
Sakura could be a popular choice. She has a long - standing relationship with Naruto in the original series, so it's easy to imagine her in a harem setting. Hinata is also very likely to be in the harem as she has deep feelings for Naruto. And then there's Ino, who has her own charm and could add an interesting dynamic to the harem.
Yugi Moto is often a very popular character. His skills and iconic cards make him a natural choice for many fanfiction stories. Kaiba Seto is also popular as his competitive nature and powerful deck add a lot of drama to the gaming scenarios. Joey Wheeler is another beloved character. His underdog story and loyalty to his friends are traits that are often explored in fanfiction within the context of the game.
It's hard to say without reading the whole novel, but often the main character in a harem - style story is quite interesting. They have to deal with multiple relationships at once. Maybe there's a character who is very mysterious and has some hidden powers or motives, which makes them stand out.