List of NPC's (non-playable characters) present throughout the Metal Slug series.
These civilians are dealers and merchants. They run if the players shoot at them. Parker was talking to one of them.
Big City Civilians
He was investigating some Egyptian ruins. He does not seem to notice the attacking Mummies scattered throughout the area.
The players can find him in Mission 2 of Metal Slug 4. When attacking the Rebels on motorcycles, he will scream and run away.
They work in an excavation site. If the players stick around for a moment, some might dig up a bonus item. One miner was attacked by a swarm of bats. One unfortunate miner was nearly turned into a mummy, but the quick reactions of the P.F. team gave him another chance to dig up loot for another day.
These children are making snowmen at the top of the mountain, but they ignore the danger they are in, because there are Rebel Infantry soldiers hidden in the snowmen, which will ambush the players when they pass near them. Their sprites are edited from the Delivery Boy.
Parker and Delivery Boy
An aged businessman. Parker was about to give the delivery boy his assignment until he noticed his suitcase had disappeared (accidentally stolen by the protagonists). He reacts in anger towards the poor boy, who runs away crying (curiously, this scene appears in Metal Slug 2, but not in Metal Slug X).
Prisoners of War captured by the Enemies. They are usually tied up, and can only wait for someone to rescue them. Upon rescue, they gratefully help their saviors with an Item or Weapons, then they will run from the chaos of battle.
This girl appears in the credits, crying for her lover that died during the war. It is suspected that her prayer is what drew the Martians to Earth, and her lover could be a Rebel soldier.
Civilians that live in a large city. They will panic and flee upon sight of Venusians. They only appear in Metal Slug 6.
This is the Regular Army Infantry, which appear in Metal Slug Advance during the Intro Landing on the island. After the battle they got captured by Rebels and they will act as POW's to be liberated by the player.
Dazed and injured survivors of the plane that went down over the quarantined area of The Ten Commandments of Moses' crash site. One by one, they will join the legions of undead unless, of course, the players can stop the advancing zombie hordes before they have a chance to assimilate more survivors. Some of them were scientists that were researching on the place, but were forced to flee when the zombies attacked. They can also be found in Mission 4 of Metal Slug 4. If the players choose the zombie path, there are plenty of them. If the mummy path is chosen instead, only one of them can be seen.
They work carrying boxes on a Japanese merchant boat. They ran and scattered when their boat was attacked by pirates and Rebels.