There's no way to tell for sure without more information about the 'frozen heart novel'. However, in a general sense, it might have a protagonist who is on a journey to understand and heal someone with a frozen heart. So, perhaps a healer or a curious adventurer could be one of the main characters, and the person with the frozen heart would be another main character. Maybe it also has a wise old mentor character who guides the protagonist in their quest to deal with the frozen heart situation.
As we don't have the details of this 'frozen heart novel', the main characters could be diverse. It could be a pair of star - crossed lovers, where one has a frozen heart due to some past heartbreak. Or it could be a group of characters, like a family where one member has a frozen heart because of some family feud or tragedy. Another possibility is that the main character is a lone wolf type who has a frozen heart from years of solitude, and then they meet other characters who start to change their perspective and gradually melt their frozen heart.
Since I don't know the exact 'frozen heart novel', it's hard to say. But it could be a young girl and a mysterious man with a frozen heart.
Another possibility is Gaara before he met Naruto. He had a really tough childhood and was initially very cold - hearted, seeing others as tools or threats. His heart was like a frozen desert, until Naruto's friendship started to thaw it. In this fanfiction, they could explore more of his pre - Naruto state of a frozen heart and how it affected his relationships with others in the shinobi world.
Since it's a Disney YA novel related to Frozen, Elsa is most likely a main character. Her frozen heart is a big part of the title, so she's bound to be central to the story. Anna, her sister, would also be a key figure as their relationship is a crucial element in the Frozen universe. Additionally, there could be new characters introduced in the novel that are important for the plot, like a mysterious figure who has some knowledge about thawing frozen hearts or a young adventurer who teams up with Elsa and Anna.
I don't know who the author of 'a frozen heart novel' is. There are so many novels out there, and without more specific information, it's hard to determine the author.
Since we don't have much information about this novel, it's difficult to say for sure. But it might have a hero - type character who is on a quest to reverse the frozen time. There could also be a sidekick or a love interest who helps or complicates the main character's journey through this strange time - frozen world.
Since I haven't read the 'frozen river novel', I can't say for sure who the main characters are.
I don't know the exact main characters as I haven't read the 'frozen river novel'. But usually in such novels, there might be a protagonist who is a local living near the frozen river.
The characters included the supporting role-Deng Lin, the young and promising little divine doctor, and the female lead-Xing Niang. Frozen Plum Heart by Qin Feilou. It was an ancient romance novel. In the 10th year of Shaoxing in the Southern Song Dynasty, a silver hairpin suddenly appeared in the middle of winter. It changed the fate of a woman and the fate of the five families of Gusu. What kind of love and hatred was behind this silver hairpin named "Plum Heart Frozen"? 。 I hope you will like this book.
If it's not about the Disney movie, it's really hard to say. It could be a story about a group of explorers in a frozen land, in which case the main characters could be the explorers themselves. They might have names like Jack, Tom, and Mary, and each of them could have different skills and personalities that help them survive in the cold environment.
It could be Sasuke. He has been through a lot of trauma, especially with the massacre of his clan. This could have led to him having a sort of frozen heart, being cold and distant. The fanfiction could explore his journey of slowly opening up again.
The main characters might include the frozen player, who is likely to be the protagonist. There could be an antagonist, maybe someone who was involved in the player's freezing or someone who wants to stop the player from achieving their goals after returning. Additionally, there could be friends or comrades of the player who either remember them from before or become new allies during their return journey.