The main characters might be individuals who have had some sort of significant event in their lives that made them have these words they wish they had said. It could be a young person who was too shy to speak up to a bully, or an adult who failed to communicate their true feelings to a family member during a crucial moment. There could also be a character who is on a journey to find the people they should have said these words to and make amends.
It might be centered around the idea of things left unsaid. Maybe the characters in the novel have a lot of emotions and thoughts that they never got around to expressing, and the story delves into how that affects their lives and relationships. For example, it could be about a lost love where the protagonist had so many things they wanted to tell their partner but never did, and now they are living with the consequences of that silence.
Since I haven't read the novel, I can't tell who the main characters are exactly. But usually in a novel with such a title, there would be a character who has the wish (the protagonist) and the character they wish to be like.
I'm not sure as I haven't read the novel specifically, but it could be a young protagonist who is given this one wish. There might also be a wise mentor figure who helps the main character understand the implications of their wish.
Since I haven't read the novel, I can't be certain about the main characters. However, it's likely that there is a central character who is the focus of the story, the one with the one wish. There may also be secondary characters like friends or family members who play important roles in the story, either by influencing the main character's decision regarding the wish or by being affected by the outcome of the wish.
Since I don't know the exact 'a wish novel', I can't say for sure. But it could be a young protagonist who is on a quest related to wishes.
As I haven't read 'the wish novel', I can't be certain about the main characters. However, it's common in novels for there to be a central character who is on a journey, perhaps a person with a strong will and a big wish. There might also be supporting characters like family members or antagonists who oppose the main character's wish.
Often in a novel with such a title, there might be a protagonist who is deeply conflicted, perhaps a character who has been wronged in some way by another character. So the main characters could be a victim - like figure and the antagonist who has caused the pain. However, without reading the book, it's just speculation.
In 'the wish of the dragon novel', the main characters could include the dragon of course. There may be a wizard or sorcerer who has some connection to the dragon's wish, either helping or trying to manipulate it. And perhaps a young adventurer who stumbles upon the dragon's situation and gets involved in the quest related to the dragon's wish.
In 'the last wish novel', apart from Geralt, Yennefer and Ciri, there are other notable characters. Dandelion, for instance, is Geralt's friend. He is a bard and often gets involved in Geralt's adventures, sometimes causing trouble but also providing some comic relief. Another character is Vesemir, an older Witcher who serves as a mentor to Geralt and the other Witchers at Kaer Morhen.
Often, there is a protagonist who is driven by a strong sense of vengeance or a need to fulfill a certain goal related to their 'death wish'. There might also be an antagonist who stands in the way of the protagonist's pursuit.