It could be because Jaune is a relatable character. He starts off as a bit of an underdog in RWBY. So, fans like to write stories where the other characters notice his potential and become obsessed with him as he grows.
One popular 'rwby obsessed with jaune fanfiction' might be 'Jaune's Unlikely Allies'. In it, the characters in RWBY show a strong focus on Jaune in various ways, like Ruby always seeking his advice during battles. Another could be 'The Jaune Effect', where the girls in RWBY seem to be overly interested in Jaune's growth as a huntsman.
Well, Jaune in RWBY fanfiction can vary a lot. Sometimes he's the underdog who overcomes huge challenges, and other times he might have unique powers or a special backstory.
One idea could be that Ruby and Jaune are partnered for a special mission outside of Beacon. Ruby's speed and combat skills combined with Jaune's strategic thinking could make them a great team. For example, they might be sent to investigate a mysterious Grimm activity in a far - off village. Ruby can quickly scout the area with her speed, while Jaune plans their approach based on the information she gathers.
One possible secret could be about his family heritage. Maybe in the fanfiction, Jaune has a hidden connection to a powerful family in the RWBY universe that he's kept under wraps for some reason, like to avoid unwanted attention or because of some family feud.
His character could become more self - assured. Jedi are known for their confidence in their abilities, and Jaune might gain that as he masters Jedi - like powers.
Ruby would most likely be involved. She's the leader of Team RWBY and has a strong sense of justice. She would be determined to find Jaune no matter what. Weiss could also be involved as she has the resources and skills to help in the search. Her family's influence and her own combat abilities would be useful.
Yang would probably have a very vocal reaction. She's not one to hold back her thoughts. She might laugh it off at first, thinking it's just a wild and crazy idea. But if the fanfiction starts to get into some deep and dark themes related to Jaune being Satan, she could become more serious. For instance, if it shows Jaune causing harm to their friends in the story, Yang would be angry and protective.
Well, in some RWBY fanfiction, the 'everyone hates Jaune' trope might be used to create drama. Maybe the author wants to explore how Jaune would grow and overcome such extreme dislike from others. It could also be a way to put him in difficult situations for character development.