The main characters are surely the dragon and the rose. But depending on the nature of the fanfiction, there could be side characters. For instance, if it's set in a medieval - like fantasy world, there could be knights who are either trying to slay the dragon or protect the rose for some reason. Maybe there are also talking animals that serve as messengers between the dragon and the rose.
In 'the dragon and the rose fanfic', aside from the dragon and the rose, there could be other characters too. There might be a wizard or a fairy who has some sort of relationship with either the dragon or the rose. For example, a wizard might be trying to control the dragon's actions regarding the rose, or a fairy could be the one who planted the rose in the first place and has a connection to it.
Most likely the dragon and the rose are the main characters, even though the rose is a plant, it can be personified in the fanfic.
Obviously, Naruto is one of the main characters. He's known for his orange jumpsuit and his goal to become Hokage. Summer Rose is also a main character in this fanfiction context. She has her own backstory and abilities that will interact with Naruto's. Their interactions are what drive the plot in most of these fanfictions, whether it's a friendly alliance or a more complex relationship.
It could be the main RWBY characters like Ruby Rose herself. Since it has 'Blood Rose' in the title, Ruby might be central to the story.
The main characters in RWBY Black Rose fanfiction are Ruby Rose and Blake Belladonna. Ruby is a young and powerful huntress with a positive attitude and great leadership skills. Blake is a former member of the White Fang, intelligent and skilled in combat.
The main characters in 'Blinded Rose RWBY Fanfiction' could be a combination of RWBY characters and new ones. For instance, a new character could be the 'blinded rose' and be guided or influenced by the more experienced RWBY characters. Ruby might play a role in helping this new character see clearly, or Weiss could be involved in some sort of power struggle or emotional journey with the 'blinded rose' character. It really depends on the author's vision for the story.
Blake and Yang can also be important characters in the fanfiction. Blake might play a role in providing her unique perspective on the events, and Yang could be there for her combat strength and her sisterly bond with Ruby. They might help Ruby and Weiss in their adventures or face their own challenges that are intertwined with the main plot of the Dark Rose fanfiction.
The main characters are Rose and Dimitri. Rose is likely to be a strong - willed and independent character. Dimitri is probably a protective and loyal character.
Obviously, Rose is one of the main characters. And usually, Marinette and Adrien also play important roles as they are central to the Miraculous Ladybug universe. They often interact with Rose in different ways, either as friends or allies in the fight against villains.
Maybe some of Draco's old Slytherin friends or acquaintances make an appearance. They could either support or oppose Draco's decision to adopt Rose, depending on their own views and how they've changed since their school days.