Guardian VI, Weapon Omega II, host for the Collective.
New Avengers (1st series) #16
Powers & Abilities:
harness mutant energy signatures for bio-electric assimilation, rechanneling the absorbed power as energy bolts, a protective aura, and thrust for flight, also capable of manifesting the individual powers from the bio-signatures he's tapping, Guardian suit regulates his power levels and remotely transmits energy signatures to him
Michael's first name was revealed in New Avengers (1st series) #17, and his last name in #18. The Collective was first referred to by that name in #19. Michael was given the Guardian suit in Civil War: The Initiative #1, called Guardian in Omega Flight #3, Weapon Omega in Marvel Comics Presents (2nd series) #1, and Omega in Dark X-Men #1.
As of X-Men Legacy (1st series) #265, Omega was comatose and being held in stasis at the Jean Grey School for Higher Learning due to his out-of-control powers. In #275, it was mentioned he would emerge from his coma in a matter of days, although the event was not actually shown on-panel.
Omega I was an android Alpha Primitive, II an alien hero, III the fusion of Box and Scramble, IV a Man-Beast alias, and V was a Thanosi duplicate.