Yes, there are quite a few. Some focus on character interactions, like how the Homestuck characters would interact with the RWBY teams in combat or in daily Beacon life. For example, a fanfic might have John Egbert sharing his adventures with Ruby Rose, and they could learn from each other's experiences in their respective strange worlds.
One popular theme is the exchange of skills. For instance, the Homestuck characters teaching RWBY characters about their unique forms of magic or technology, and vice versa. It's interesting to see Ruby learn about the Homestuck's hemospectrum, for example.
One challenge is getting the characterizations right. Homestuck has very distinct and complex characters, and when you cross them over with characters from another fandom, you need to make sure they all stay true to their original selves. Another is the world - building. Combining two different fictional worlds can be tricky to make it seem seamless.
A good plot could involve a villain from the Homestuck universe creating chaos in the Avengers' world. The Homestuck characters come to help, but there are misunderstandings at first between them and the Avengers. However, as they start to understand each other's powers and motives, they form a strong alliance to defeat the villain.
Well, I really like the 'Homestuck x My Little Pony' crossovers. In these fanfictions, the Homestuck characters get thrown into the magical world of Equestria. It's fun to see how they adapt to the pony culture and interact with the ponies. There are also some 'Homestuck x Kingdom Hearts' crossovers that explore the idea of different worlds colliding, just like in Kingdom Hearts, but with a Homestuck twist.
Maybe the Sburb game from Homestuck starts to affect the Marvel universe. The Guardians of the Galaxy could be drawn into it, thinking it's some new cosmic threat. The Homestuck trolls' hemospectrum - related powers could interact in strange ways with the superpowers in the Marvel world. For instance, a high - blood troll's strength might be compared to that of the Hulk.
There could be all sorts of possibilities! Maybe characters from both universes team up to solve a mysterious threat or get caught in a timey-wimey adventure. The crossovers could feature unique blends of magic and technology.
The Mask's influence on the RWBY world might also change the appearance of things. If Weiss were to encounter the Mask, it could transform the elegant and icy settings she's used to into something more zany. The ice sculptures in her family's manor could start dancing around like in a wacky cartoon. And the Grimm, the dark creatures in RWBY, might react in strange ways to the presence of the Mask - perhaps they would be both terrified and strangely attracted to it at the same time.
One idea could be to have the characters from Hetalia and Homestuck participate in an international event together. For example, a global gaming tournament where the strategic minds of the Hetalia characters and the unique abilities of the Homestuck characters collide. Another plot could involve a dimension - hopping adventure where the Hetalia countries find themselves in the Homestuck universe and have to adapt to its strange rules and customs while trying to find their way back home. Or perhaps a story where the trolls from Homestuck end up in the Hetalia world and start causing chaos among the different nations.
RWBY crossover RWBY fanfiction can enhance the universe by exploring new relationships. For example, characters who have never interacted much in the original series can form new bonds. This gives a deeper understanding of the characters' personalities. It can also expand on the lore. By mixing different elements from within the RWBY world, new aspects of the history, magic, and technology can be revealed.