The following is a list of recurring fictional characters that appeare thorough the Metal Gear series in more than one canonical installment. The series' canon is comprised (not including re-releases and remakes) of Metal Gear (MG) and Metal Gear 2: Solid Snake (MG2) for the MSX2, Metal Gear Solid (MGS) for the PlayStation, Metal Gear Solid 2: Sons of Liberty (MGS2) and Metal Gear Solid 3: Snake Eater (MGS3) for PS2, Metal Gear Solid: Portable Ops (MPO) for PSP and the forthcoming Metal Gear Solid 4: Guns of the Patriots (MGS4) for PS3.