Gubayama was an unidentified individual who was mentioned by the Colonel during the Big Shell Incident. After Arsenal Gear's AI, GW, became infected with a computer worm in 2009, the simulacrum that GW had fashioned to serve as Raiden's commanding officer began to make strange comments to Raiden via Codec. One of these utterances referred to the Colonel having seen "Gubayama the other day in Shibomnigee," and that he had said for the Colonel to give Raiden his best. Having never heard of this person before, Raiden was left confused.