The Doctor is most likely one of the main characters. There could also be his companions, though without more specific knowledge about this short story, it's hard to say exactly who else.
The story might be about the Doctor facing some kind of threat related to a 'ghost in the machine'. It could involve a computer or technological system that has an unexpected and perhaps malevolent presence within it, like a digital entity that is causing trouble or mystery.
Their stories provide first - hand accounts. It's one thing to read about the numbers and facts of the genocide, but hearing from the survivors makes it real. For instance, they can describe the atmosphere during that time, which textbooks can't fully convey.
Perhaps there is a young alien who witnesses the start of the genocide and becomes a symbol of hope for their species. On the human side, there could be a journalist who discovers the truth about the genocide and tries to expose it. Another possible main character could be an alien elder who holds the knowledge and secrets of their race and is trying to protect it from being completely wiped out.
A 'genocide graphic novel' can contribute by making the concept more accessible. The combination of images and text can reach a wider audience, including those who might not be inclined to read a long, dry historical account. It can also make the horror more immediate and visceral, which is more likely to stay in people's minds.
One challenge is the emotional toll on the storytellers. Survivors may have to relive their traumas. For example, a survivor of the Cambodian Genocide may find it extremely difficult to talk about their experiences.
Telling genocide stories is crucial as it commemorates the victims. It ensures that those who perished are not forgotten. For example, the Holocaust stories keep the memory of six million Jews alive. These stories also educate future generations about the horrors of such inhumane acts.