SCP-835-JP is described as a teenage girl with long black hair who wears mainly black school uniforms, named Keteru Yamiko. She is generally considered "attractive". Her character is often described as melancholic due to her taciturnity and lack of emotional ups and downs. She has the power to teleport in the dark and used to use this to slowly kill of the staff at SCP until they found a way to stop her. Now she's harmless. She hopes to apologise and chose a staff member to serve.