Metal-Tan (義足子, Gisoku-ko) is a robot-like NPC found in the Monochrome World. She resides in the house on the bottom screen of the monochrome world. She doesn't do much besides walk around her house.
Metal-tan is a robot-like girl with pure white skin, a matching dress, and long messy black hair. She also appears to have robot legs, much like Sabitsuki's Machine Effect, and black crosses around her eyes.
- Like other NPCs, she can be killed with the iron pipe; however, unlike other NPCs, once she is killed she will stay dead permanently, even after Sabitsuki wakes up.
- If she is hit a second time after already being hit once, she makes a different, quieter painful moan. After that, she makes no other noises.
- Her name was created by fans on Uboachan.
- She bears some resemblance to Monoko from Yume Nikki and Visi from Fleshchild.
- If you come to her room during the endgame, she is nowhere to be found.