A common theme is the clash of different powers. Sonic has his super speed and unique abilities, while the RWBY characters have their own semblances and combat skills. The fanfictions often explore how these powers interact when they meet. For example, how Sonic's speed can be used against the Grimm or in battles with RWBY villains.
There's also 'Sonic meets RWBY: A Chaotic Crossover'. In this one, Sonic's speed and abilities are pitted against the Grimm in a really exciting way. It delves into how Sonic's presence changes the dynamics in the RWBY universe. The author does a great job of integrating Sonic's world elements, like the Chaos Emeralds, into the RWBY story.
The unique aspect is the combination of two very different universes. RWBY has its own complex world with Grimm, Dust, and Huntsmen, while Sonic has his high - speed adventures. In fanfiction, seeing Sonic's speed in the RWBY world is really cool.
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.
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.
First, you need to be familiar with both the Sonic and Archie universes. Know their characters, settings, and storylines. Then, come up with an interesting concept for the crossover. It could be a simple adventure where the characters meet by chance, or a more complex plot involving a shared threat.
There might be a fanfiction where Sonic teams up with Ruby Rose. Since they both have a sense of justice and a determination to protect, they could go on adventures together, with Sonic's agility and Ruby's scythe - wielding skills making for an exciting combination. For example, they might face a new type of enemy that requires both their unique abilities to defeat.
In a fanfiction, their relationship could also be explored in terms of leadership. Naruto has led his team in many battles and has a sense of responsibility towards his comrades. Raven has her own group and her own way of leading. They could compare and contrast their leadership styles. Maybe they would have some disagreements at first, but as they get to know each other better, they could find a middle ground and lead a combined force against a greater threat in the RWBY universe.
One possible plot could be that an ancient evil threatens both the Sonic X universe and the Sonic Boom universe simultaneously. Sonic from Sonic X and Sonic from Sonic Boom have to team up, along with their respective friends. They could start by accidentally crossing into each other's worlds through some sort of interdimensional rift. At first, they might be a bit confused and even a little competitive, but as they realize the scale of the threat, they combine their unique skills. Sonic X's Sonic is more used to high - tech environments and has different power - ups, while Sonic Boom's Sonic is more in tune with his natural island surroundings. Together, they could battle the evil and in the process, learn a lot from each other and their friends, ultimately saving both universes.
Eggman Nega could be a great main antagonist. He has the intelligence and the desire for power. He could find a way to open portals between the Sonic X and Sonic Boom universes to steal resources and technology from both. His plans would force Sonic X's Sonic and Sonic Boom's Sonic to team up against him. He could use his robotic creations from both universes, combining the advanced tech from Sonic X and the more rustic, yet effective, machines from Sonic Boom.