The Amadeus Syndicate is a criminal organization specialized in cyber terrorism and robotic, represents the main antagonist in Metal Slug 4.
Classification: Criminal Syndicate
Territory: Their HQ and some parts of the world obtained by manipulating the Rebel Army.
Technology and Abilities: Peak to Superhuman physical characteristics, weapon and vehicle mastery, likely a certain degree of hand to hand combatant and stealth knowledge (Due to being an army of trained soldiers), minor acrobatics(Soldiers are able to perform jump attacks on the ground as well as jump off flying vehicles), explosion manipulation, flight(With air vehicles), underwater breathing (Type 3 via Sea Satan), preparation, hacking, social influencing, inorganic physiology (Type 2 for vehicles and robots), Danmaku (When in large numbers), large size (Type 0 to 1 depending on the machinery), camouflage (Via snowsuits), energy projection, summoning, electricity manipulation, fire manipulation, biological and disease manipulation, purification (Type 3), immortality (Type 7 for mummies and zombies), minor teleportation and insect manipulation (via mummies), organic manipulation (via zombies), self-destruction(via rebel zombies), resistance to disease manipulation, some forms of poison manipulation and possibly radiation (via hazmat suits)
Attack Potency: Street level to Large Building level, possibly higher
Power Source: Very likely oil, electricity, gas and other common power sources on earth.
Notably Individual:
The Doctor: The leader of the Amadeus Syndicate. He is the one who arranged the army of the syndicate, deceived the rebels and started the war. Among his inventions there are the white baby virus and likely all of the special machines possessed by the Syndicate.
Weakness: Soldiers are prone to slack off and lower their guard when not engaged in combat.
Forces:
Soldiers: Troops specialized in military combat on foot and most of them are compromised by rebel soldiers.
Pirates: Bandits of the sea hired by the Amadeus Syndicate to board a cargo ship of the Rebel Army. They are equipped with cutlass and pistols.
Scientist: Researchers of the Amadeus Syndicate that can also take part in combat. They are equipped with a special rifle whose bullets contain a serum that turns it's victims into monkeys.
Hazmat Soldiers: Special units of the Amadeus Syndicate, which are enstaked with handling biological weapons. They are equipped with knives and grenades containing the zombie virus or the mummy gas and are dressed with hazmat suits to protect themselves.
T-2B Melty Honey: A light tanketta focused on speed. It is lightly armored, with a hefty spiked plate added additional frontal defense. It's only armament is the frontal cannon that fires slow guided missiles.
Girida-O: The main battle tank of the rebellion army, balanced between mobility, firepower and survivability. It fires cannon shells that fires in an arc.
Di-Cokka: One of the main tanks of the rebel army. It is more armored than the Girida-O and is armed with a cannon capable of rapid fire.
M-15A "Bradley": A tank specifically designed to be a long ranged artillery unit. It is able to fire a volley of rockets either directly in the front of it or in an arc by rotating the turret.
Nop-03 Sarubia: A fairly armored vehicle designed for support fire and keep the enemy busy. It drops rolling mines from it's canon.
Iron Iso: A heavy tank designed mainly for defense. It's heavily armored, serving well as an armored roadblock and as cover for troops, and other vehicles.
Flying Tara: A secondary airplane used by the rebels.
Modern Robot: Androids that possess the same appearance of Donald Morden. These robots are equipped with rocket launchers and are highly resistant. However, once received too much damage, they will partially explode, revealing their true metallic appearance, normally concealed by artificial skin. Once this happens they will drop their bazookas and start to limp around. They are still dangerous, since their body can release electricity and their head can explode, causing damage to those caught by the blast.
Mecha Allen: Another type of android, who possess the appearance of Allen O Neil. It's equipment and combat behavior are the same as the original, but is said to be more durable than him.

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Villains Death Battle
ActionThis will have various amounts of villains from across the series of manga, cartoons, movies, games and mythology that will face off against other combatants to the death. I don't own any of these characters and it belongs to their creators.