Another possible storyline is that an Earth Soldier is actually a long - lost relative of a RWBY character. This connection could bring out new character developments as they explore their family ties while also dealing with the threats in the RWBY world. There could be a struggle between the Earth Soldier's values and the more fantastical and dangerous world of RWBY.
Some fanfictions might have a storyline where the characters swap personalities. Yang could become super shy and reserved, while Blake turns into a hyper - active and overly talkative character. This would lead to all sorts of comical situations as they try to adapt to their new personalities while still facing the challenges of the RWBY world. The team would have to figure out how to work together in this new, wacky dynamic.
One interesting storyline could be a character from RWBY getting injured during a battle and having to recover in the hospital. There, they might meet new allies or face unexpected challenges within the hospital setting. For example, dealing with a shortage of medical supplies due to Grimm attacks on supply routes.
One interesting storyline could be a fanfiction where the characters have to face an ancient evil that was long forgotten in the RWBY universe. This evil could be something that predates the Grimm and has powers that are completely different from what they are used to dealing with.
One interesting storyline could be a soldier's journey from being a low - ranked footman to a respected knight. He might face many challenges like battles against wildlings, political intrigue within his own camp, and proving his worth to his superiors.
One interesting storyline could be a super soldier OC who has to hide their powers from the normal world while trying to solve a mystery that only their abilities can help with. For example, they might be on the hunt for a secret organization that's creating dangerous weapons using super soldier technology.
Another storyline might involve Mercy patching up Soldier 76 after a particularly tough battle. As she heals his wounds, she realizes how much he has sacrificed for the cause. This makes her see him in a new light, and she starts to develop feelings for him. Meanwhile, Soldier 76, who has always been focused on the mission, begins to notice Mercy's kindness and beauty. Their relationship then evolves as they try to balance their duties in Overwatch with their growing feelings for each other.
Another possible storyline is the OC swordsman's quest for a powerful sword or a lost technique. This could involve exploring ancient ruins in the RWBY world, facing various challenges and enemies along the way, and perhaps uncovering secrets about the world's past related to swordsmanship.
Perhaps the OC is an outsider who has some information about a new threat to Vale. Glynda initially suspects the OC but as they interact more, she realizes the OC is genuine. They then form an alliance to investigate the threat, and during this process, a friendship or something more might develop between them. Their different personalities, Glynda's strictness and the OC's more free - spirited nature, could create some interesting dynamics in the story.
Another storyline could involve them using the group chat to plan a surprise party for one of their friends at Beacon Academy. They'd discuss decorations, food, and how to keep it a secret. There could be some comical moments when things almost go wrong during the planning process.
A third storyline could be centered around a mysterious character who joins the team temporarily. This character has a hidden agenda that the team gradually uncovers. It could lead to a lot of suspense and action as the team tries to figure out whether to trust this new addition or not.