The main characters are the ones symbolized by 'tiger' and 'rose'.
Since it's a 'romance of tiger and rose novel', the main characters are likely to be the tiger and the rose, which could be personified in some way in the story.
The main plot often involves the relationship between the 'tiger' and 'rose' characters. Usually, there are elements of love, conflict, and character development. For example, they might start as enemies or from different worlds and gradually fall in love through various adventures and misunderstandings.
The main plot often involves the relationship between the tiger and the rose in the story. It might include their encounters, the development of feelings between them, and the challenges they face together in their fictional world.
Obviously, Briar Rose is one of the main characters. And as it's a romance novel, there's likely to be a male lead, perhaps a brave knight or a charming prince. There may also be a villain, like an envious sorceress.
Since I don't know the exact 'rose novel', I can't say for sure. But it could have a female protagonist who is drawn to the beauty and mystery of the roses in the story.
I'm not sure specifically as I haven't read it, but it could be a code - breaker, a spy, or a person in a position of power.
I don't know for sure, but perhaps there could be a gardener who takes care of the rose garden. This person might be central to the story as they know all the secrets of the garden.
There's no way to know exactly without more information. However, if it's a typical graphic novel, there could be a hero or heroine, which could be Rose if the title is related to her. There might also be an antagonist, someone who opposes Rose's goals or causes trouble for her. And then there could be side characters like a wise old mentor or a mischievous little brother.
Since I don't know the specific 'the black rose novel', I can't say for sure. But it could have a brave hero or heroine as a main character, someone who is drawn to the mystery of the black rose.
I'm not sure exactly as I haven't read it. But it could be a king or queen since there is a crown in the title. And maybe a person who is associated with the rose, perhaps a gardener or a noble who has a special relationship with the flower.