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.
There could also be fanfictions that are more about character development within the harem. For instance, a new character joins the harem and has to learn how to fit in. Ben helps her adjust and in the process, they all grow closer as a group and become more effective in fighting off bad guys.
Some fanfictions might explore the relationships within the harem. Maybe there's a story where Ben has to deal with jealousy among the members of his harem. He has to find a way to keep everyone happy and maintain the harmony of the group while still saving the day as a hero.
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.
One popular 'Ben 10 Ben and Gwen fanfiction' could be those that focus on their adventures in different dimensions. For example, there might be a story where they end up in a dimension full of magical creatures and have to use their combined skills to get back home. Another could be about a time when Ben loses his Omnitrix and Gwen has to use her magic to protect them both until he gets it back.
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.
I'm not sure about extremely popular 'ben 10 harem fanfic' stories specifically. However, in the world of fanfiction, there are likely some that have gained a following among 'Ben 10' fans who are interested in the harem genre. You can probably find some by searching on popular fanfiction websites.
There are fanfictions where Mal and Ben face a new villain together. This could involve them using their combined skills, Mal's magic and Ben's leadership. Some fanfictions also explore their life in Auradon from the perspective of other characters in the story, which gives a different take on their relationship.
One popular 'Ben 10 Female Fanfiction' story could be those that focus on female characters taking on new and unique roles within the Ben 10 universe. For example, a story where a female character becomes a powerful alien hybrid in her own right, similar to Ben but with her own set of challenges and adventures.
One popular OC is a female alien with telekinetic powers. She stands out because her powers are both useful in combat and in helping Ben solve problems. Another is a human girl who is a tech - genius. She can upgrade Ben's alien devices and often comes up with clever plans. There's also an OC that is a shape - shifter from a previously unknown planet, which adds an element of mystery to the harem.
First, you need to know the characters well. Read up on the Ben 10 series to understand Ben's personality, his powers, and the world he lives in. Then, think about the characters you want to include in the harem. Decide on their personalities and how they interact with Ben.
One idea could be exploring an alternate universe where Ben has different alien forms with unique abilities not seen in the original series. Another could be a story focused on Ben's relationships with his friends and family in a more in - depth way, like how they react to his alien - changing powers. A third idea might be a time - travel story where Ben goes back in time and has to use his powers to fix something in the past.
A great fanfiction idea could be a story set in the future. Ben and Kevin are older and have trained new heroes. However, an old enemy resurfaces, but this time with a much more devious plan. The story could explore how their experiences over the years have changed them and how they use their wisdom and skills, along with their still - strong bond, to defeat the foe.