A less common but interesting trope is the 'culture clash' trope. The very different cultures of RWBY and God of War could lead to some funny or tense moments. For instance, the way the characters in RWBY view honor and friendship compared to how Kratos might view it. This can create a lot of depth in the story as they try to understand each other's values while dealing with the overarching plot.
The team - up trope is also quite common. Kratos joining forces with the RWBY team to take on a powerful foe. This allows for interesting battles and strategies as they combine their different fighting styles. Also, the 'lost in a new world' trope is popular. A character from either universe finding themselves alone in the other universe and having to figure out how to survive and get back home.
One popular trope is the 'Redemption of the Humanoid Grimm'. In many fanfictions, a humanoid Grimm might start to question its nature and purpose. Another is the 'Forbidden Love' trope, like a human falling in love with a humanoid Grimm, which creates a lot of conflict and drama. Also, the 'Power Struggle' trope is common, where the humanoid Grimm is either fighting against other Grimm or trying to gain power among humans.
One popular trope is the crossover of characters' abilities. For example, a character from Blue Exorcist might use their exorcism powers in the RWBY world, or a RWBY character could learn about the demon - fighting techniques. Another is the team - up trope, where characters from both series join forces to face a common enemy. This could be a powerful demon in the RWBY universe or some sort of Grimm - like threat in the Blue Exorcist world.
One popular trope is the 'redemption arc' for the Valkyries. Since some of them are initially presented as antagonists in the game, fanfiction often explores their journey towards redemption. Another is the 'forbidden love' trope, like a Valkyrie falling in love with a character from a different faction. And the 'power - up' trope is also common, where a Valkyrie gains new and extraordinary powers.
One common trope is the fish - out - of - water scenario. The female Naruto, coming from a very different world, has to adjust to the rules and culture of RWBY. This often leads to humorous situations as she tries to understand things like Dust or the concept of Semblances. Another trope is the power - exchange. For instance, Naruto's chakra - based powers might interact in unexpected ways with the Aura and Semblance powers in RWBY.
One popular trope is the 'underdog story'. The Onyx Guard might be portrayed as the underdogs in a difficult situation and they have to fight their way through. It adds a lot of drama and tension to the story.
A common trope is the 'mentorship' one. Harry, with his wealth of magical knowledge and combat experience, could mentor Ruby or other characters in RWBY. There's also the 'culture clash' trope. The different cultures of the Harry Potter universe and RWBY would lead to interesting interactions. For example, the way magic is perceived in each world and how they deal with threats. And the 'team - up against a greater evil' trope is likely, where they join forces to fight a powerful enemy that threatens both their worlds.
The 'fix - it' trope is quite popular. Since Summer Rose is a beloved character who had a tragic end in the original RWBY story, many fanfictions use time travel to let her fix things. For example, she could save characters who died prematurely.
One common trope is the 'Fish out of Water' where the main character, often a self - insert or an original character, finds themselves in the RWBY universe and attracts the attention of multiple characters from the show, forming a harem. For example, a character from our world suddenly ends up at Beacon Academy and has to adapt while dealing with the romantic interests of Ruby, Weiss, Blake, and Yang.
The 'Lost Family' trope is also common. In many fanfictions, Percy discovers long - lost relatives who are also connected to the sea gods. This adds a new layer of family drama and mystery to his story. It often involves him having to make difficult decisions between his new - found family and his old friends at Camp Half - Blood.
The redemption trope can be seen too. Maybe the Courier has some past mistakes or a dark history from Fallout New Vegas, and in the RWBY world, they find a chance to redeem themselves. This can be a really deep and emotional trope, as the Courier tries to become a better person while interacting with the more idealistic characters in RWBY.