It would almost surely include Ruby and her team. However, there could also be other characters that are introduced in this fanfiction specifically related to the imperial order. Maybe there's an imperial leader or some soldiers within the imperial order who become important characters as the story progresses. But the core RWBY characters are bound to be the main focus as they face this new situation.
Most likely the main characters from RWBY, like Ruby Rose, Weiss Schnee, Blake Belladonna, and Yang Xiao Long. Since it's a fanfiction based on RWBY, they would probably be at the center of the story dealing with the arrival of the imperial order.
I'm not sure exactly as there could be many different interpretations in fanfiction. It might be about some sort of imperial order arriving in the RWBY universe and how the characters deal with it, like the main RWBY team facing new challenges, perhaps new enemies or political situations related to this imperial order.
The roles included: supporting role-Gu Xiaoxing, the hot shot, supporting role-Yang Yili, chief employee, male lead-Fang Hong, handsome enough, female supporting role-Wu Qianqian, Eldest Senior Brother's beautiful chef. "The Descent of the Global Order" by Bu Gaimin. It is a game/game novel that contains the elements of the game, warrior, teacher, and senior brother. It has been completed and can be enjoyed without worry. [User recommendation: Order's "National Evolution" invades Planet Sky Blue] Global Digitalization, Starting the Path of Evolution Fang Hong was resurrected as a martial artist. I hope you will like this book.
The roles included: supporting role-Gu Xiaoxing, the hot shot, supporting role-Yang Yili, chief employee, male lead-Fang Hong, handsome enough, female supporting role-Wu Qianqian, Eldest Senior Brother's beautiful chef. "The Descent of the Global Order" by Bu Gaimin. It is a game/game novel that contains the elements of the game, warrior, teacher, and senior brother. It has been completed and can be enjoyed without worry. [User recommendation: Order's "National Evolution" invades Planet Sky Blue] Global Digitalization, Starting the Path of Evolution Fang Hong was resurrected as a martial artist. I hope you will like this book.
Since I don't know the exact 'arrival short story', I can't say for sure. But often in such stories, there could be a protagonist who is the one arriving. There might also be characters that the protagonist meets upon arrival, like a local who helps the new arrival navigate the place or a fellow traveler who has a different perspective on the arrival.
I don't know as I haven't read the novel.
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.