Past life regression can introduce unique relationships. In manga, two characters might have a connection from their past lives that they are unaware of at first. This can create a slow - burn discovery process that hooks the readers. In light novels, it can provide a different perspective on character growth. Instead of just growing within the current life's experiences, the character is also influenced by their past life self. For instance, a character who was a coward in their past life might strive to be brave in the current life, and this struggle for change is what adds depth to the story.