There might be a young wizard in training. He lives in a small cottage on the outskirts of a magical forest. In the cold winter, he discovers that some of the forest creatures are in trouble because of the cold. So he uses his budding magical powers to create warm shelters and sources of heat for them. He faces challenges like not having enough magic energy at first but he learns to overcome them as the story progresses.
It could be a lone traveler who is trying to reach a warmer place during the cold winter.
It could be about a character's struggle during a cold winter. Maybe they are lost in a snowstorm and have to find shelter.
There could be a powerful elder dragon as one of the main characters. This dragon might have a lot of wisdom and be a guiding force for the younger dragons.
A corporate tycoon who is known for his cut - throat and cold business tactics could be one of the main characters. The other could be an idealistic young journalist who is determined to expose him. But as she gets to know him better, she realizes there is more to him than his cold exterior, and they end up falling in love.
It could be an old man who has seen many winters. He might be sitting by his fireplace, reminiscing about his past on that cold winter night.
A fearless warrior. This character could be a part of the imperial army or a lone wolf. They might be on a quest to avenge their family who was wronged by some powerful figure in the empire. Their journey would take them through different parts of the 'empire of winter', facing various challenges.
Peppa Pig is definitely one of the main characters. Her family members like her mummy pig, daddy pig, and little brother George are also important characters in these stories.
In addition to Team RWBY, characters like Qrow or Professor Ozpin might also play important roles. Qrow, with his combat experience and knowledge of the world, could guide the younger characters in facing the winter - related threats. Ozpin, on the other hand, might have some hidden knowledge or plans related to the significance of this particular winter.
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.
Obviously, Harry Potter himself would be a main character. He would be the one with the connection to the magical world, and his character would be transformed by the influence of the Winter Soldier elements.
Since it's an OC (original character) tale, the main characters are likely the original characters created for this fanfic. Without reading it, we can't know their names or exact details, but they are probably characters that the author has developed to fit into the Bleach Winter War setting.