Forgiveness could be another important theme. The characters in the 'bad memories novel' may need to find a way to forgive themselves or others to move on from the bad memories. This could involve coming to terms with the past and accepting what has happened.
It could revolve around a story where the main characters are haunted by bad memories. Maybe it shows their journey to overcome these memories, or how these memories affect their present lives and relationships. For example, it could feature a character who had a bad childhood experience and the visual novel explores how that still impacts them as an adult in various aspects like their career choices or love life.
Well, it depends on your perspective. But generally, Negan is considered bad in the comic because of his cruel and violent actions towards the main characters.
One benefit is that it improves your mental state. By reframing bad memories in a humorous way, you are training your mind to look at things more positively. This can reduce stress and anxiety related to those memories. Another advantage is that it can enhance your creativity. Finding the humor in a bad situation requires you to think outside the box and come up with creative ways to tell the story. And it can also be a great form of self - expression, allowing you to show your unique sense of humor and how you've grown from difficult experiences.
Since I haven't read it, I can't determine the main characters. But usually in a visual novel, the main characters are those whose stories are central to the plot. They could be people who have had some sort of life - changing bad memories, like a survivor of a disaster or someone who has been through a difficult relationship.