Prometheus

Prometheus (プロメテ, Puromete) is a mysterious character from Mega Man ZX and Mega Man ZX Advent. He and his sister Pandora are servants of Model W. He wields a beam scythe and uses fire and shadow-based attacks in battle.

Personality
Prometheus is an arrogant fighter who enjoys nothing more than senseless killing and a good battle (Ironically, when Ashe/Grey defeats him and his sister, he hints that his having to do senseless fighting was one of the reasons as to why he and his sister wanted to betray and kill Albert in the first place.). He also seems to hold a grudge against Vent/Aile and refers to him/her as a pawn in his game. His personality has yet be further explored, as his connection to Ashe. Being the 'voice of Model W' however, he seems to have inherited Dr. Weil's insanity and nihilism.

Pre-ZX
Prometheus is the first Reploid created by Albert, identified as DAN-001. Like his sister, he was given a fragment of the Model W Biometal to become one of Albert's first Mega Men. Eventually, Prometheus and her Sister managed to temporarily escape Albert's control, attempting to flee, but were unfortunately captured and permanently fused with a fragment of Model W. The result not only traps him in his Megamerged form, but leaves him no choice but to participate in the Game of Destiny in order to seek out and confirm the strongest Mega Man there is.

Mega Man ZX
After Serpent had excavated the Biometals Model H, Model F, Model L and Model P prior to the games events, Prometheus and Pandora approached Serpent. Several company workers mentioned that after their meeting, both Serpent and Slither, Inc. changed their way of business.

Prometheus and Pandora worked with Serpent in order to reawaken the dormant Model W. Prometheus encounters Vent/Aile in Area D alongside his sister and Serpent after defeating and forcing Giro to fight them. Vent and Aile attempt to shoot Serpent down in anger but their charged shots are easily deflected by Prometheus and leaves, mocking Model X and Z as mere legends. He reappears again with Pandora to ambush Guardian HQ only to be defeated. In Vent's story, he notices that Prairie is not of this time when she rushes in after hearing about her sister and leaves. He reappears alongside his sister to confront Vent and Aile at Area O but are soundly defeated, despite their formidable skills and leave the two Mega Men, making no reappearances afterwards. After both of them are defeated, they disappear until ZX Advent.

Mega Man ZX Advent
In ZX Advent, it's revealed that Prometheus and Pandora are sibling Mega Men, "DAN-001" and "DAN-002" created by Master Albert to further the Game of Destiny. Albert intentionally created with repeatedly short life spans so that they would not be able to betray him. Prometheus kills Albert's decoy at the Submerged Volcano in the mistaken belief that it was Albert. However, he and Pandora continue to proceed with the Game of Destiny in the hopes that they can take Albert's place, and attack Grey/Ashe. After Grey/Ashe defeats the pair, Model W absorbs their souls and the real Albert appears. The volcano begins to collapse, and Grey/Ashe is unable to rescue them. Despite the falling of a volcano on them they may not be dead. They are highly speculated to have survived the encounter

Trivia

 * In Greek mythology, Prometheus was the Titan who created man, gave them fire, and taught them how to trick the gods in order to get the better half of a sacrifice. Prometheus was punished for this by being shackled to a mountain peak and having an eagle pick at his liver for eternity. His brother and mankind was punished by receiving Pandora and the evils she unwittingly carried in her box.
 * In Bob and George, in the future "X Era" Proto Man takes up the name Prometheus.