Marco Rossi: is the main character and protagonist of the series, who has been playable in the main Metal Slug games (Metal Slug 1 to Metal Slug 7) making cameos in different secondary games of the saga as an example Metal Slug Advance. Idaho-born Italian-American, Marchrius Dennis Rossi is a Major in Metal Slug 6, Lieutenant in Metal Slug of the PF Squad, and Commander of Company 1 of the Squad. Marco is a kind man, but capable of falling into uncontrollable outbursts; that the villain of the series, General Morden (who is responsible for the deaths of dozens of friends and colleagues of Marco in the PF Brigade), will try to take advantage of.

Metal Slug is a Japanese run and gun video game series originally created by Nazca Corporation before merging with SNK in 1996 after the completion of the first game in the series.