It is not a popular genre at all. Mainstream fanfic communities are centered around positive, family - friendly, and ethical content. The inclusion of 'futanari' which is inappropriate makes it something that is not likely to gain popularity or be widely accepted among the general fanfic - reading public.
Since 'futanari' is not suitable for general discussion, let's focus on 'charmed'. If it's a fanfic related to the 'Charmed' series, it could involve the sisters from the show facing new challenges, having different relationships, or exploring new magical abilities. Maybe the fanfic writer wanted to add their own take on the well - known 'Charmed' universe, with elements that are different from the original show, like new magical creatures or a different take on the Power of Three concept.
There may be some 'kushina futanari fanfic' works out there, but it's hard to determine if they are popular. Given the nature of the concept, it may not be as well - known or widely shared as other types of fanfic. It could be that only a small group of fans who are interested in both the 'Kushina' character and the 'futanari' concept are aware of and follow these works.
I'm not entirely sure if it's a highly popular genre. It's quite a niche and specific type of fanfiction. There are so many different genres and themes in fanfiction, and this one might appeal to a very particular group of readers who are interested in those specific elements. It also depends on the overall popularity of the related concepts in the broader media or cultural context from which the fanfiction is inspired.
Well, there is a fanfic called 'Futanari's Hidden Power'. In this story, the futanari character discovers a special power within herself that she has to learn to control while facing various challenges in a world filled with other anime - style characters. There are also some fanfics that explore the relationships of futanari characters in a high - school anime setting, like 'Futanari High School Days' which focuses on the daily life and relationships in that context.
I'm not sure there are widely 'popular' ones in the mainstream sense as futanari content is a niche within the Star Wars fanfic world. However, in some specialized fanfic communities, there might be stories that gain a bit of a following.
A popular idea might be a fanfic that delves into Caulifla's relationships with other characters in her futanari form. It could explore how her new form affects her interactions, like with her friends or rivals. For example, how she might use her unique abilities in battles against foes who underestimate her due to her different form.
One popular 'Charmed Harry' fanfic could be 'The Magical Crossover'. It combines the magic of the Charmed world with Harry Potter's universe in an interesting way. The story might involve Harry somehow getting involved with the Charmed Ones and their battles against evil.
One popular idea could be a crossover with 'Buffy the Vampire Slayer'. The Charmed Ones could team up with Buffy and her gang to fight a common supernatural threat. Maybe a powerful demon that is causing chaos in both their worlds.
Well, it's not really a common genre in the general sense of literature. Mainstream literature focuses on a wide variety of themes like love, adventure, and social issues. 'Futanari' has sexual connotations that are not in line with the norms of regular literature, so it's not common at all.
A third idea might be a fanfic where a Futanari character is from an unknown planet but has a connection to the Dragon Balls. They come to Earth in search of the Dragon Balls, not for wishes like most, but to study their power source. Along the way, they meet the Z - Fighters and have to prove themselves worthy of being part of the group.