They might be intrigued by the complex magic systems in Fate Zero that are different from their own world. For example, Ruby could be really interested in the various types of Servants and their unique abilities, comparing them to the Grimm and Huntsmen in her world.
Yang would probably be excited by the action - packed scenes in the fanfiction. The epic battles between the Servants could remind her of her own fights against strong opponents. Also, Weiss might be analyzing the social hierarchies and power structures in Fate Zero, thinking about how they compare to the Atlesian society she comes from.
It could inspire new combat techniques. For instance, if they see a Servant using a unique form of magic - based combat, they might try to adapt it to their own fighting styles. Ruby could learn about strategic use of different powers from the Fate Zero characters and apply it when facing tougher Grimm.
Archive of Our Own (AO3) is also great. It offers a wide range of Fate Zero fan works, often with more in - depth categorization and tagging, which makes it easier to find exactly what you're interested in. And it has a good community that respects different writing styles and themes.
Some characters might be shocked at how their stories are being re - imagined. For example, Saber could be intrigued by different interpretations of her quest for the Holy Grail. She might question some of the motives given to her in the fanfic that are different from her own self - understanding.
One way is to adjust their power levels according to the new setting. For example, if a RWBY character enters the Fate world, their semblance might be toned down a bit to match the power scale there. Similarly, Fate characters in Remnant could have their magic restricted in some ways. Another way is to give them new abilities or limitations that balance them out. Maybe a Fate servant in Remnant can't use their full power because the magic in Remnant is different.
Ruby would probably be very interested in the different kinds of magic shown in the Fate series fanfiction. It might give her ideas for new ways to use her own semblance. Weiss, being the more refined one, would appreciate the elegant and complex settings of the fanfiction. She might also study how the characters interacted in high - society - like situations. Blake would be interested in the moral and ethical dilemmas the characters faced, seeing similarities to the ones she has faced in her own life. Yang would find the strong - willed characters inspiring and might even try to learn from their determination in battle.
Typically, you'll have the main RWBY characters like Ruby, Weiss, Blake, and Yang. And from the Japanese Zero side, the character Zero himself is often a main focus. He interacts with the RWBY gang in various ways, sometimes as an ally and other times as a bit of an enigma they need to figure out.
First, you need to be very familiar with the Fate Zero universe. Know the characters, their personalities, and the overall plot. Then, come up with an interesting concept. It could be a different take on a character's backstory or a what - if scenario. For example, what if a certain character made a different choice in a key moment? After that, start writing and don't worry too much about making it perfect in the first draft.
Ruby is often a popular character. Her silver - eyed ability could have some unique interactions in the Sub Zero setting. Weiss is also quite popular as her ice - related powers might be enhanced or changed in interesting ways.
The main characters could be the RWBY team, as they are the core of the RWBY universe. However, depending on the creativity of the fanfiction writer, new characters could also be introduced. Maybe there's a new character who is an expert in the 'Ready Player Zero' - like digital world and teams up with the RWBY girls. But overall, it's very likely that Ruby and her friends are the main focus in this fanfiction.
It can expand their personalities. For instance, if they're in a Lord of the Rings crossover, their reactions to the different races and the concept of the One Ring could show new sides of them. Maybe Yang would be more cautious in a world full of powerful magic and ancient evils.