Amadeus is the leader of the Amadeus Syndicate. He is the main antagonist and final boss of Metal Slug 4. He is a friend of Donald Morden and, after his Rebel Army lost their funding, Amadeus assisted them by providing them with soldiers and advanced weaponry.
Amadeus makes his debut appearance in the game Metal Slug 4 as the head of the Amadeus Syndicate. He helps Morden to obtain new weaponry, and together they create an army comprised of soldiers from Morden's army and his own troops.
He appears at the end of the game as the final boss. He has 3 types of robots. Two robots, as well as a central computer used to control various weaponry in the vicinity. First computer is armed with missile launchers, claws, electric cannons, and ring laser. Second computer is armed with a claw, built-in gatling guns, satellites cannon, and giant ground saw. The central main computer controls multiple laser guns, laser cannon, drone and a wave that attempts to kill you by covering the whole area. After defeating him, the base begins to collapse while he is still stuck inside the last machine. It is unknown if he survived the destruction of the base.
- Amadeus is a theophoric given name derived from the Latin words ama – the imperative of the word amare ('to love') – and deus (god). As a linguistic compound in the form of a phereoikos, it means "Love God!". The German-language equivalent is "Gottlieb'; Slavic versions include "Bogumil" and "Bohumil". Other related names are the female form, "Amadea", the French "Amédée (fr)" (male), the Spanish "Amadeo", the Italian "Amedeo", and "Amadis". In contrast, the Greek name "Theophilos" means "friend of God".