The weeping, red-eyed Mars-san
|Location||The Martian Underground|
|Notes:||Reacts unusually to being stabbed.|
He is a tall, indigo creature with a single large eye and a single foot. He is found weeping near what appears to be a crashed locomotive.
Mars-san produces a remorseful three-tone chime (high b flat - e flat - f) when Madotsuki interacts with him, coupled with a small darkening of the screen.
Additionally, he can be stabbed with the knife effect. This will not kill him, but leaves a wound on his foot and changes the color of his eye from red to green; a second stabbing will change his eye color back to red.
Some theorize he is crying due to being the last of his kind and misses his family, or because he is mourning the dead of the train crash.
- Some fans consider the creature that is sometimes seen in the pond on The Witch's Island to be the son of Mars-san due to its likeness to him. video of the creature
- Mars-san is a significant character and a large source of speculation. He is included in most theories about the game.
- He is said to resemble the lamp on the desk in Madotsuki's Room