There are some RWBY - focused fan communities and forums where you can find genderbent fanfics. For example, the RWBY forums might have a section dedicated to fanfiction. Members often post their own works or recommend others. You can also try looking on Wattpad, although it's more known for a wider range of stories, but there are still RWBY - related ones there. Just be sure to check the reviews and ratings to find the better - quality genderbent fanfics.
One interesting concept could be the change in character dynamics. For example, if Ruby was male, his relationship with Weiss might have a different flavor. Maybe he'd be more brash in his approach to her initially. Another concept could be the way they fight. A male Ruby might have a different fighting style, perhaps more strength - based rather than relying on speed as much as the female Ruby. Also, the male versions of the characters could have different in - group relationships, like a male Blake might be more of a leader among the group in some interpretations.
Jaune is a character that many like to genderbend. His journey from a novice to a more skilled fighter can be re - imagined in a genderbent version. As a female, her insecurities and growth could be explored in a different light. Pyrrha is also a popular choice. Her skills and status as a champion in the original can be given a new spin when she is genderbent, perhaps with different relationships and interactions with the other characters.
There's also 'The Female Uzumaki'. In this fanfic, the genderbent Naruto has to deal with different expectations from the village. It dives deep into how she overcomes the challenges and still manages to be a strong ninja. The story also changes some of the dynamics with other characters like Sasuke and Sakura in interesting ways.
A plotline could involve Si's genderbent self having to prove themselves in a world that may have different perceptions of their new gender. They could struggle with how others view them and at the same time, discover new aspects of their own abilities. Maybe they were underestimated in their original form, but as a genderbent character, they show everyone what they're truly capable of. It could also involve a romantic sub - plot where their new gender changes the dynamics of their relationships with other characters in the RWBY universe.
I'm not sure of specific 'Si gets genderbent RWBY fanfiction' titles off the top of my head. You could try searching on fanfiction platforms like Archive of Our Own. There are often filters you can use to find fanfics related to genderbending in the RWBY universe.
Another theme is relationships. Since the gender of the main character is changed, the relationships with other characters also change. For example, a romantic relationship with Sasuke or Sakura could be very different. In some fanfics, a female Naruto might have a more sisterly relationship with Sasuke, while in others, a more complex romantic dynamic could develop.
One popular 'Harry Potter Genderbent Slytherins Fanfic' is 'The Slytherin Princess'. It reimagines the Slytherin characters as female and gives a fresh perspective on their relationships and the overall Hogwarts dynamic. Another good one could be 'Slytherin's New Image' which focuses on how the genderbent Slytherins change the traditional views of the house in the wizarding world.
Good world - building makes a RWBY fanfic great. Since RWBY has such a rich world with its different kingdoms, Dust, and Grimm, a fanfic should respect and expand on that. If a fanfic can make you feel like you're actually in Remnant, with all its unique cultures and landscapes, then it's doing something right. Another important aspect is the action scenes. RWBY is known for its cool fight choreography, and a fanfic should be able to capture that same energy in its written battles.
One popular 'genderbent Harry Potter fanfic' is 'The Girl Who Lived'. It reimagines Harry as a girl and explores how that would change the story dynamics. For example, the relationships with other characters like Hermione and Ron might have different nuances. Another one could be where genderbent Harry has a different approach to dealing with Voldemort, perhaps using more feminine wiles in addition to magic.
In these fanfics, the genderbent Slytherin characters often retain some of the classic Slytherin traits like ambition and cunning. For example, a female Draco - like character might still be very much goal - oriented but could show her ambition in more subtle, perhaps more traditionally 'female' ways, such as through networking and building alliances.