Todo's appearances in the JJK manga are scattered. It depends on the specific storylines and conflicts. Sometimes he's in the foreground, and other times he makes cameos to add to the overall narrative.
The key elements in a 'todo visual novel' include a clear theme. This gives the whole work a sense of direction. Also, character design is important. You need to create characters that players can relate to or be interested in. And don't forget about the user interface design, which should be intuitive for players to navigate through the story.