It could be an original character created for this fanfiction. This character might be the focus because they are the one with the words on their skin. They could be a new student at Beacon Academy, and the words on their skin set them apart from the others. It might attract the attention of Team RWBY and other characters, and they all get involved in uncovering the mystery of these words.
Another possibility is that it involves some of the villains in RWBY. Maybe Cinder has words on her skin that are related to her quest for power. These words could be a clue to her past or a key to unlocking even more power, and the fanfiction could explore her backstory and motives more deeply through this concept of the words on her skin.
Since I haven't read this particular fanfiction, it's hard to say for sure. But in RWBY, it could be Ruby, Weiss, Blake, and Yang. Maybe the 'words on skin' concept is related to one of their stories, like Ruby finding some strange words on her scythe which is an extension of herself, and it leads to a new adventure for her and her team.
I'm not entirely sure specifically what this 'words on skin rwby fanfiction' is about without reading it. But it could be that the words on the skin are a form of magic spell or incantation. Maybe a character discovers these words on their skin and has to figure out what they mean and how to use them, which could lead to all sorts of adventures and battles in the RWBY world.
Sasuke could also be a main character. In the Naruto universe, Sasuke is Naruto's rival and friend. In the fanfiction, he might be involved in battles against Naruto to test the limits of his iron skin, or they could be teaming up and Sasuke could be using Naruto's iron skin as a form of protection in dangerous situations.
Perhaps there is a new vampire character whose origin story is connected to the etching on their skin. This character could be the central focus, with their interactions with the known Twilight characters driving the story. They might be in conflict with some of the traditional vampire clans because of their unique marking.
I'm not sure specifically as there are many possible interpretations in fanfiction. It could still feature Ruby, Weiss, Blake, and Yang as main characters, but with a plot centered around dilation. For example, Ruby might be the one to first notice something strange related to dilation and lead the team to investigate.
I don't know for sure without reading it, but it could feature the main RWBY characters like Ruby, Weiss, Blake, and Yang. Since it's a fanfiction, there might also be an original character who is the'stray' that the story focuses on, and this new character could interact with the main RWBY quartet.
Obviously, Cliffjumper is one of the main characters. In most of these fanfictions, he is the one bringing his unique set of skills and personality into the RWBY universe. Then there are the main RWBY characters like Ruby, Weiss, Blake, and Yang. Ruby with her leadership and scythe - fighting skills, Weiss with her Glyphs and swordplay, Blake's stealth and katana - using abilities, and Yang's brawler - like combat style often interact with Cliffjumper in different ways in the fanfictions.
In most 'rwby yellowbeard fanfiction', Yellowbeard takes center stage. He's the one with the unique look and backstory. But the RWBY girls are essential too. Ruby with her leadership skills, Weiss with her grace and combat abilities, Blake with her stealth, and Yang with her strength. There may also be other characters from the RWBY universe that pop up, like Professor Ozpin or Qrow Branwen, who might interact with Yellowbeard in different scenarios.
In some RWBY Anbu fanfiction, there could be an original character who is part of the Anbu. This character might be the central focus, with their backstory and relationships with both the Anbu and the RWBY characters being explored. For example, an Anbu character who was once a student at Beacon but had to leave for some reason and now returns as an Anbu member. They would then have complex relationships with the RWBY characters based on their past and present.
Since I haven't read it, I can't say for sure. But it might include the grandmaster as a main character. There could also be some of the original RWBY characters like Ruby, Weiss, Blake, and Yang, who interact with the grandmaster in different ways, either as students, allies, or opponents.
Often, the main characters in grandmaster RWBY fanfiction include the well - known characters from the RWBY series such as Ruby, Weiss, Blake, and Yang, but in their grandmaster versions. They have enhanced skills and more responsibilities.