It depends on the specific fanfiction. But it could be a Stark, like Sansa or Arya. Maybe the 'Winter Rose' is a symbol associated with their journey of growing up and becoming powerful in the complex world of Westeros.
In some fanfictions, it could be a new character created specifically for the story. This character might be a noble from a minor house in the North. They could be on a quest related to the 'Winter Rose', like protecting it from those who would use it for evil purposes. This new character could interact with well - known 'Game of Thrones' characters, such as Jon Snow. Jon might be drawn into the mystery of the 'Winter Rose' and help the new character in their mission.
In 'Game of Thrones' fanfiction, the 'Winter Rose' could be many things. It might be a symbol representing a character's beauty or purity, like a rare flower in the cold North. It could also be the name given to a character, perhaps a noblewoman or a mysterious figure.
Arya Stark is also a common character paired with the Winter King in fanfiction. Arya's skills as an assassin could be useful to the Winter King's cause. She might be sent on secret missions by him or they could form a bond over protecting the innocent in the North.
Definitely Daenerys Targaryen. She was a major force in the previous story, and her quest for the Iron Throne is far from over. She has her dragons and a large army, so she'll be in the thick of things.
Since it's a fanfic related to 'Game of Thrones', it might include characters such as Arya Stark. Given her skills and her journey in the original series, she could play an important role in this fan - made story set during winter's wrath. Sansa Stark could also be a main character, perhaps using her political acumen to deal with the difficulties brought by the harsh winter. And of course, Tyrion Lannister, with his wits, might be involved in the events and power struggles that occur during this time.
Daenerys Targaryen is the most important character related to the dragons. She is their mother in a sense as she hatches them and raises them. Jon Snow also has a connection later on as his Targaryen blood makes him related to Daenerys and the dragons in a way.
There might be a maester who has knowledge about the lost dragon. He could be an important character as he might hold the key to understanding where the dragon is or how to find it. Also, a skilled warrior could be involved. This warrior might be tasked with protecting the person who is searching for the lost dragon or be on the search himself. He could be from a noble house that has an interest in the power that the dragon represents. In addition, there could be a mysterious figure, perhaps a sorcerer or a seer, who has some hidden agenda regarding the lost dragon.
It could be a new character created specifically for the fanfiction. This character might be an outcast from a noble house who receives the call and is thrust into the center of the power struggles in Westeros.
Often, the Gravewalker themselves is a main character. They usually have a mysterious past and special abilities. There could also be characters from the original Game of Thrones series who interact with the Gravewalker. For example, Jon Snow might cross paths with the Gravewalker and they could form an alliance or be at odds. Daenerys could also be involved, perhaps seeing the Gravewalker as a threat to her claim to the Iron Throne.
In some fanfictions, Jon Snow could be a central figure when combined with the angel elements. Imagine an angel bestowing upon Jon some new powers or knowledge that helps him in his fight against the White Walkers. And there could be a female angel character who has a special bond with Jon, guiding him not just in his battles but also in his personal growth as a leader.
Often, there could be a young and idealistic character who leads the uprising. Maybe a bastard son or daughter of a noble house who has seen the injustice in the system. Another could be a former slave who has escaped and now wants to free all his fellow slaves. And there might be a maester who has been exiled from the Citadel for his radical ideas and joins the uprising.