Mars People have a large head with multiple tentacles placed below. Their tentacles are fairly strong as they can hold a weapon using only one of their appendages. Contracting their tentacles allows them to jump large distances and descend slowly. They have great intelligence and own psionic powers like telekinesis and space-warping in various degrees. They are also experts in necromancy and biological engineering.
According to their death animations, Martians possess a skull and green blood. Some artwork shows them to have mouths. The Game Over screen of Metal Slug 6 shows the skull of a Mars Person, revealing them to also have teeth and a nasal cavity. The skull appears to be made of bone. Severed tentacles writhing about after dismemberment suggest an involuntary nervous system.
Their weapon of choice is a gun that can fire varying types of spores. These spores are destructible by knife and gunfire. Mars People's words are mostly formed with the syllables Pa-Pe-Pi-Po-Pu (except Rootmars and Marty). These syllables also form the Martian Language, and a translation device is required to understand them.
Types of Infantry
|Mars People: This Martian is the normal run of the mill Martian army soldier. They fire orange spores that move slowly and home towards the player; these shots can easily be dispatched with gunfire or melee attacks. Very weak, can be killed with melee attacks.|
|Mars People Cabre: Experienced soldiers able to sustain more shots than the standard Martian using various energy pistols. They usually shoot their spores three times in a row.|
|Mars People Elite: Elite soldiers with commanding roles that fire blue spores three times in a row. Their spores are faster and harder to destroy but cannot home in on the player. As their rank and rarity suggests, they can take more punishment than their comrades. However, a grenade or a few melee strikes can easily kill it.|
|Mars People Officer: The most elite Martians. They are capable of distorting space-time with their psionic powers in order to call in artillery strikes directly from Fake Rootmars. They first appear in Metal Slug Attack.|
|Mars People Chief Operating Officer: Top ranking officials of the Martians who are also in charge of current affairs. They have stronger versions of the Officers' attacks. They compose the Martians' high command and first appear in Metal Slug Attack.|
|Mars People Neo: A significantly stronger mutated Martian who Rootmars bestowed his power upon. Only one Neo exists: the Earth's expeditionary Martian forces second-in-command who the Professor calls "Marty", since he was annoyed with the fact that the Martians lacked proper names.|
|Halloween People: Disguised Mars People trying to understand and infiltrate human society.|
|Mars People Pocket: Young martian recruits tasked with surveillance missions.|
|Mars People (ACE): Drives the Mini-UFO in early versions of Metal Slug Defense, though the pilots were later changed to regular Mars People. It also appears in Metal Slug Attack. Possibly a yet to be revealed ace-pilot type of martian unit.|
The Mars People appears as a hidden playable character and mid-boss. He attacks using his tentacles and his gun, and can also call a traditional Japanese-style UFO. His attacks are named after paranormal folklore, such as the Tunguska Blast of 1908 and the Roswell incident.
He appears again as a playable character, with little different than his SVC counterpart. A Mars People model is available in a variety of different colors.
- Like many parts of their forces, Mars people themselves have some visual basis on the Martian invaders from H.G. Wells' literary classic "War of the Worlds", where they are originally described as cephalopods with psychic abilities.
- The Mars People also have some basis on the common depiction of Martians in Japan. While in western culture Martians are green-skinned humanoids, in Japan they are depicted as octopi.
- In the first mission of Metal Slug X, when you destroy the barricades, you can see burning Martian corpses being thrown out of the blast.
- In Metal Slug 6, the spore which Martians fire is the same as the captain, but travels slower.
- The Ptolemaic cultist shoot what resembles Martian spores from their pistol.