Aeolus

Aeolus is an antagonist that appears in Mega Man ZX: Advent. He is one of the chosen ones selected to be the next Mega Man and is a biomatch for Biometal Model H.

Personality
Aeolus is described as a perfectionist and has an air of superiority. He also displays trait of misanthropy, deeming the human race ignorant to the point that they deserve to be eradicated (believing that they are the root of all conflicts). Although he not above working with other and seems to tolerate the other Mega Men: Atlas, Siarnaq, and Thetis in order to impede Grey/Ashe's progress.

In spite of this way of thinking, Aeolus appears to be somewhat touched by individuals sacrificing themselves for another, as evidence of his respone to Biometal Model Z staying behind to face the four Mega Men, in order for Vent/Aile to rescue Ashe/Grey.

Biography
Aeolus first appeared accompanied by Siarnaq when Grey/Ashe defeated Rospark and witnesses a Raider's soul being absorbed into Model W. As Grey/Ashe prepare to do battle, Aeolus and Siarnaq had more pressing issues to attend to, while taunting the rookie Mega Man before leaving with the Model W. Aeolus meets the protagonist again at the Floating Ruins, where he engages them in battle for the Model W that is disturbing the area's gravity, but ultimately lost and vows to achieve his goals before making off with the Model W.

Aeolus is seen next to the Chosen Ones in Model A's ciphers. He appears again alongside Atlas, Siarnaq, and Thetis in the Ouroborus to block Grey/Ashe's path to Albert. He perfectly convinced that he can defeat all of his opponents and ultimately become the king of Mega Men. However Aile/Vent soon arrive to distract them while Grey/Ashe escape and the 5 begin to battle.

In the following event when Ouroborus starts to crumble after the defeat of Master Albert, Model Z chose to remain behind and face the four alone, while Vent/Aile went to the aide of Ashe/Grey, whom had fainted after the battle. Using his knowledge of Biometals, Model Z somehow managed to disable their movements. The outcome of their battle remains as of yet unknown. If the player beats the game on Expert mode, a hidden ending scene shows Aeolus and the other three alive and well in there megamerged states, though it is unclear whether or not they're copies of the originals.