Since I have no prior knowledge of this novel, it's hard to say for sure. But it could be that there is a group of characters and one among them, who is different in some way, is the 'star' in winter. Maybe it's a story of a family where one member is the star that brings light during a difficult winter period for the whole family. They could have different personalities and relationships within the story that are yet to be explored.
Not having read it, I can only guess. There might be a protagonist who is a struggling artist or a lonely traveler. And perhaps there are supporting characters like a kind old man or woman who help the main character, the 'star' in this wintry story, on their journey.
The main characters might include a detective if it's a mystery set in winter. He or she could be a jaded but brilliant investigator who has to deal with the cold and the secrets that the winter seems to hide. There could also be a group of friends who find themselves in a dangerous situation during winter, like being trapped in a remote cabin with a murderer on the loose.
In 'the winter soldier novel', the most prominent character is the Winter Soldier. However, other important characters may include those who are trying to help him break free from Hydra's control. There could be some fellow soldiers or agents who discover his true nature and decide to assist him. Also, antagonists within Hydra who will do anything to keep him under their control are likely to be part of the main characters in the story.
Since I haven't delved into 'the Winter King' novel, it's difficult to name the exact main characters. However, based on typical fantasy or historical fiction themes, apart from the eponymous Winter King, there could be a brave knight who is loyal to the king. There might also be a wise old wizard or a cunning court jester who, in his own way, influences the events in the kingdom. And of course, there could be an enemy leader who is constantly plotting against the Winter King.
Since I'm not familiar with 'the winter girl novel', it's difficult to name the main characters precisely. But based on the title, the central character is the winter girl. She may have a best friend who stands by her side throughout the events of the story. There could also be an older person, perhaps a grandparent or an old family friend, who imparts wisdom to her during the winter. Additionally, there might be a character who is a bit of an outcast in the story, and the winter girl forms an unexpected bond with this person, which becomes a crucial part of the plot.
I don't know the exact main characters as I haven't read it. But they could be ordinary people like a hunter, a mother, or a young adventurer.
In many novels, there are often characters that represent different aspects of society or human nature. In 'Fatal Winter', there might be a wise old character who imparts knowledge and wisdom to the younger ones, helping them survive. There could be a young and impulsive character who often gets into trouble. And there might be a character who is a symbol of hope, always looking for a way out of the difficulties that the fatal winter brings.
There could be an old wise man who has seen many winter solstices and imparts his wisdom throughout the story. He might be a guide to the younger characters.
I'm not sure as the 'Winter Story' isn't defined in detail. But it could be a family trying to stay warm during a harsh winter, so the main characters would be the parents, children, and maybe an old grandparent.
The main character is the Winter Soldier himself, Bucky Barnes. There are also other characters like Nick Fury who often plays a role in the story, either guiding or being involved in the events related to the Winter Soldier.
Without having read the novel, it's hard to say for sure. However, it's likely that there is at least one central character whose life is significantly impacted during this one night in winter. This character could be facing a personal crisis, such as a broken relationship or a career setback. There might also be supporting characters who interact with this main character, such as a neighbor who offers help or a stranger who becomes involved in their situation in some unexpected way.