The Walking Dead isn't classified as a visual novel. It's known for its intense zombie-themed storylines presented mainly through comics and TV. Visual novels have a specific format and gameplay elements that The Walking Dead doesn't possess.
Yes, it can be. It can serve as an introduction to Negan's character, which is a significant part of the 'Walking Dead' story. Even new fans can quickly get into the story and understand his role.
Michonne does die in the comics. The circumstances surrounding her death were quite dramatic and had a significant impact on the story's progression. It happened during a major conflict with other characters.