In Root Letter Visual Novel, the protagonist is a very important main character. He is driven by the letter from his pen - pal to seek answers. His pen - pal, though not physically present throughout most of the story at first, is a crucial character as her past and what happened to her is the core mystery. Then there are the town's inhabitants. There might be an elderly person who holds some long - forgotten memories related to the pen - pal, a young person who has some fresh insights, and maybe a suspicious character who seems to be hiding something. All these characters interact with the protagonist and shape the story as it unfolds.
The protagonist is one of the main characters. And of course, his pen - pal whose mystery he is trying to solve. There are also other characters in the town where he goes to investigate, but the specific details about them can be discovered as you play through the visual novel.
The main character, who is the recipient of the mysterious letter, is central. His pen - pal is another key figure, even though she's somewhat of an enigma at the start. In the town he visits, there are various characters like the locals who might have known his pen - pal or have some connection to the events. For example, there could be an old friend of his pen - pal or a local who has some hidden knowledge. Each character plays a role in helping or hindering the protagonist's search for the truth.