There might be a wise old character. In many novels, such a character serves as a guide. In this 'death in change novel', this old character could have seen many deaths and changes over the years and helps the other characters understand the significance of death in the process of change. For example, they might share stories from their past about how they coped with similar situations.
I'm not sure specifically as I haven't read the 'death in change novel'. But usually, in a novel dealing with death and change, there could be a character who is on a journey of self - discovery and has to face the death of someone close. Maybe a young protagonist who is forced to grow up because of a death in the family.
Perhaps there is an antagonist whose actions bring about death and change in the lives of the other characters. This character could be driven by greed or power and their actions set in motion a series of events that involve death and force the other characters to change in order to survive or overcome the situation.
L is obviously one of the most important characters. He is a brilliant detective with an eccentric personality. His intelligence and unorthodox methods are key to the story. Near also plays an important role. He is another highly intelligent character who is involved in the events related to the Death Note.
There's no way to tell exactly without more information. However, it might have a group of characters. There could be an older mentor figure who guides the others through the change. And perhaps a villain or an antagonist who is trying to stop the change from happening. This would create conflict and drive the story forward.
I'm not sure specifically as I haven't read it. But usually, the main characters are those who drive the story forward. They could be ordinary people caught in extraordinary circumstances related to the change the novel is about.
One of the main themes could be transformation. Since 'change' is in the title, it might deal with how characters change and how death can be a part of that transformation. For example, a character's death could lead to the change in the lives or perspectives of other characters.
I'm not sure specifically as I haven't read the 'death notice novel' in detail. But usually in such novels, there is a protagonist who is likely to be someone involved in solving the mystery or facing the challenges related to the 'death notice'.
The main characters could include the god of death, of course. There might be a human character who has a special connection to the god of death, perhaps a seer or someone with a rare gift. And there could be a council of deities that the god of death has to interact with, whether they are allies or foes. These various characters would each contribute to the overall plot and theme of the novel.
Since I'm not familiar with the book, it's hard to say who the main characters are. But they could be humans who are involved in the robotics industry, like engineers or scientists. Or perhaps there are some special robots that are the focus, such as a robot detective or a powerful combat robot.
Since I don't know the specific 'death watch novel', I can't say for sure. But they could be the people on the death watch, like a doctor, a family member, or a professional caregiver.
Since I don't know the specific 'death crone novel', I can't say for sure. But likely, the death crone herself would be a main character. There might also be characters whose lives she affects, like a young hero who tries to stop her evil deeds if she's a villain, or a person seeking her wisdom if she has a more ambiguous role.
The main character is Gustav von Aschenbach, an aging writer. And then there's Tadzio, the beautiful young boy who becomes the object of Aschenbach's obsession.