Shirakami Fubuki has a dark side roommate and companion named Kurokami, they have known each other for a long time. Kurokami birthday is on 6 September. Kurokami favorite drink is Cola; her favorite food is meat. Kurokami got a 3D model on Fubuki's 2019 birthday celebration.[105] On 6 September 2022, Kurokami debuted her 2D model during her birthday stream. Prior to this, Kurokami used a still image each time she appeared on stream. Kurokami calls her fans "Servants"「サーヴァント」("Geboku"「下僕」).