Hideo Kojima is a secret character in Metal Gear Solid: Peace Walker based on the creator of the Metal Gear franchise. In the "Infiltrate the Crater Base" mission, when the player is supposed to find the truck with the missiles, Kojima can be recruited by entering the truck marked "Centro America 63824 Peace Sentinel".
Kojima has an S rank in Medicine and Intel.
Hideo Kojima also appears as a character in Metal Gear Solid V: Ground Zeroes during the Side Op "Intel Operative Rescue". He is the VIP target that Big Boss and Miller rescue.
In addition to Ground Zeroes, Kojima also appears in Metal Gear Solid V: The Phantom Pain as a staff member, if save file from Ground Zeroes is downloaded. His specialty is intel and is the main focus of several side ops, which usually involve rescuing him from captivity.
In Mega Man Battle Network 4, there is a character named Ozuma Kantoku that provides Lan with some hidden information. Ozuma's appearance is based on that of Hideo Kojima, but is not Kojima by name.