In many 'Ben 10 Harem Fanfiction' stories, a prevalent plotline is the exploration of different alien cultures within the context of the harem. Since Ben has the Omnitrix and can transform into various aliens, his harem members, who might be from different species or have different backgrounds, introduce him and the readers to unique cultural elements. This can range from their social hierarchies, mating rituals if appropriate and not overly sexualized, to their ways of communication. Another plotline could be about how the harem members adapt to living on Earth, or how they help Ben in his fight against villains that target Earth specifically because of his presence or the presence of the Omnitrix.
One popular Ben 10 Ben Harem fanfiction could be those that focus on Ben's adventures with his harem while facing new alien threats. For example, a story might have Ben and his harem working together to stop an evil alien warlord from taking over the Earth. They use their combined powers and skills to outwit the enemy.
One popular Ben 10 harem fanfiction might be those that focus on unique character interactions. For example, stories where Ben has to deal with the different personalities in his harem while on an adventure. It could involve his alien forms playing different roles in these relationships.
Another plotline could be a Pokémon trainer who has a special ability that makes Pokémon more attracted to them. This ability leads to a collection of Pokémon of different species, both male and female, forming a sort of harem around the trainer. They might all compete for the trainer's attention in a friendly way.
One common plotline is a female trainer finding herself in a situation where multiple male Pokemon characters are attracted to her. For example, she might be on a journey and these Pokemon, in their human - like forms, start competing for her attention. They could offer her help in battles or with finding rare items in exchange for her company.
Sometimes, in the Loud House harem fanfiction, there could be a time - travel or alternate universe scenario. For instance, a character travels to an alternate version of the Loud House where the family dynamics are different, and they end up in a harem - like relationship with different versions of the Loud family members. This adds an interesting twist to the normal storylines.
A frequent plotline is the training aspect. Naruto could teach some of Rias's peerage his ninja training techniques, which would be quite different from the normal training in the devil world. This can lead to new power - ups for the characters. There are also plotlines where Naruto is mistaken for a powerful devil or some other supernatural being in the 'High School DxD' world. This misunderstanding can create a lot of chaos and interesting story developments as he tries to clear his name while also dealing with Rias's harem and the various factions in that world.
Some plotlines in Accel World harem fanfiction involve time - travel elements. The main character might go back in time and change things, which then affects his relationships with the harem members. There could also be a plot where the harem members compete in a tournament within the Accel World, and the main character has to support them all while also dealing with his feelings for each one.
One common plotline is the main male character, often Naruto, having various kunoichi from the Naruto universe develop feelings for him over time. For example, Sakura, Hinata, and Tenten might all be part of the harem. Another plotline could involve Naruto going on special missions with the kunoichi in his harem, and during these missions, their relationships deepen. There can also be plotlines where Naruto has to protect his harem of kunoichi from a new threat in the ninja world.
Some fanfictions have a plot where Naruto is sent to train in the Land of Water. There, he trains with Mei's subordinates and catches Mei's eye. She then decides to take Naruto under her wing. As Naruto grows stronger, more female characters, such as Ino, sense his power and charm, and they all end up in a sort of harem situation around Naruto.
One popular plotline is the characters from Naruto and RWBY coming together in a shared universe. For example, Naruto characters might end up at Beacon Academy in RWBY's world. Another plotline could involve a character from one series having to adapt to the powers and culture of the other series while building relationships with multiple characters, creating a harem dynamic. It often includes elements of friendship, teamwork, and the discovery of new abilities.