One common theme is the clash of cultures. Since Ranma comes from a very different world than RWBY, there's often a focus on how his Japanese - influenced upbringing and martial arts background interact with the more Western - inspired RWBY world. For example, his ideas about honor and combat might be different from what the RWBY characters are used to.
There's also 'Ranma and the Huntresses'. In this fanfic, Ranma finds himself in the world of RWBY and has to adapt to the whole concept of Huntsmen and Huntresses. It delves into how his martial arts skills can be useful in this new world filled with Grimm and other challenges. It's really cool to see how he forms relationships with the RWBY characters like Ruby, Weiss, Blake, and Yang.
One common element is the combat aspect. In Ranma 1/2, there are all kinds of martial arts battles, and in RWBY, there are intense battles with weapons and semblances. This makes for great fight scenes when combined in a crossover. For example, Ranma could use his martial arts skills against Grimm in RWBY.
Perhaps a fanfic where Trans Female Ranma uses her unique position to bridge the gap between the male - dominated martial arts world and the female characters. She could start a new style of martial arts that combines the strength and techniques of both genders, and in the process, she becomes a symbol of change and acceptance in the Ranma world.
One characteristic is the expansion of the Ranma universe. Fanfic writers often create new settings, like new villages or cities that Ranma visits. They also might introduce new characters, either as friends, rivals, or love interests for Ranma. Additionally, Ranma fanfic can be very character - driven. It might explore Ranma's internal struggles, such as his identity crisis due to his curse. It also could look at how other characters react to Ranma's unpredictable nature, which is another important aspect.
It's not appropriate. Ranma is a well - known anime/manga series, and creating or promoting sex - related fanfic detracts from the original work's intended values. The original work is about adventure, humor, and relationships in a more family - friendly sense. This kind of inappropriate fanfic can also make the fan community seem less welcoming and more seedy.
One of the common characters is Cologne. She has a lot of knowledge and wisdom, so she might be involved in trying to figure out what happened to Ranma or she could be using Ranma's new form for her own purposes. Nabiki is also likely to be in these fanfics. She might try to profit from Ranma's situation, either by selling the story or using it to her advantage in some other devious way.
One great Ranma 1/2 and RWBY crossover fanfic is 'The Martial Artist in Remnant'. It has an interesting plot where Ranma's martial arts skills are put to the test in the RWBY universe. The characters from both series interact in a really engaging way.
Martial arts battles are also a common theme. Given that the series is centered around martial arts, fanfics will continue this trend. New opponents might be introduced, or different martial arts styles could be explored. It keeps the action part of the story alive.
I'm not sure if it's popular. It depends on how many people are interested in the Ranma character and dragon - related themes in fanfiction. There are so many fanfics out there that it's hard to gauge the popularity of a specific one without more research.