BIOGRAPHY - page 5
Back on Earth-616, Proteus decided he wasn't happy being dead anymore, and arranged to bring himself back to life. To accomplish this, he planned to roughly recreate the process previously used by Harness and Piecemeal. Proteus took advantage of Selene's work restoring dead mutants to life by affixing a small portion of his energy signature, and therefore his consciousness, to the precognitive Destiny as she was resurrected. (This worked because Destiny died on Muir Island, a place with one of the largest concentrations of residual Proteus energy.) Although the quantum of Proteus energy involved was not enough to truly "possess" Destiny as he had people in the past, Proteus was able to influence Destiny's perceptions so that she saw a future of his design, and acted accordingly.
Destiny mentally reached out to Utopia during the Necrosha uprising and passed on her vision (and unwittingly a portion of Proteus energy) to the similarly powered Blindfold. Now being influenced by Proteus as well, Blindfold confirmed Destiny's obscured vision that a threat was rising on Muir Island, and the X-Men needed to stop it. Trusting their premonitions, Cyclops dispatched Blindfold with a squad of X-Men for Muir. Once they arrived, Proteus was able to use Blindfold like a "psychic magnet", soaking up more and more Proteus energy from his familiar surroundings until she reached critical mass, and enough Proteus energy was consolidated in one place to truly resurrect Kevin MacTaggert, letting him fully possess Blindfold. Destiny had recognized her error after passing the energy on the Blindfold, but arrived too late to stop Proteus's ascension.
Once he was restored, Proteus turned on the X-Men, particularly his murderer Colossus who was among the team, and Magneto whose power over Proteus's weakness, metal, made him the most dangerous. Worse still, Proteus's experience reconstituting himself taught him how to split his energy among multiple bodies, possessing several X-Men simultaneously as he added Nightcrawler, Husk, Trance and Psylocke to his existing hosts Blindfold and Destiny. 
Rogue struck back at Proteus, stealing Psylocke's psi-knife to disrupt his control of his hosts one by one. As Rogue's stolen power wore off, Magneto magnetically launched himself and "Blindfold" into low orbit. Although Proteus managed to redirect them back to Earth, the distraction gave Magneto the time he needed to electromagnetically identify Proteus's energy wavelength, and disrupt it. With Proteus back in the same position he was in when he initiated his own resurrection hours earlier, Psylocke questioned how they knew he wouldn't return one day. Magneto ominously replied that, in fact, they should know that he WOULD return. [X Necrosha #1, X-Men Legacy (1st series) #231-233]
The scattered essence of Proteus resonated on the astral plane, where those ripples were detected by Amahl Farouk, the Shadow King. Farouk connected with Proteus' mind through his energy fragments, causing him to experience relative thousands of years of torment. In time, Shadow King chose to use Proteus' energy as an amplifier for his own psychic energies. By seeding elements of Proteus’ energy form in the astral plane, Farouk created a link by which he 
could seize control of any psychic, turning them into a weapon under his control via the unified field of Proteus’ diffuse energies. He battled the X-Men in London after temporarily seizing control of Psylocke, who then guided several X-Men into the astral plane to battle the Shadow King. Farouk directed Proteus’ energy to possess and direct large crowds of Londoners in the real world, fighting a war on multiple fronts. [Astonishing X-Men (4th series) #1-6]
Eventually, the disembodied consciousness of Farouk's main opponent, Charles Xavier, was reincarnated on the physical plane in the body of Fantomex. A renewed man, the young and cocky 'X' had led the X-Men in defeating Shadow King on the astral plane, then turned his abilities towards freeing the possessed people of London. X had not recognized the nature of the energies 
Farouk used in London, however, and didn't realize that retrieving the possessing green energy and gathering it all together was the last thing he wanted to do. Thanks to X's efforts, Proteus’ energy form was reconsolidated and he became a physical being once more. [Astonishing X-Men (4th series) #7]
The X-Men attempted contact with Proteus, and so Kevin allowed X and Psylocke to commune with his mind. He acknowledged he had made mistakes in the past, but claimed 10,000 years of relative time in the Shadow King's clutches had led him to understand how he'd hurt people before. However, he also had no desire to ever be caged again. Kevin MacTaggert offered the X-
Men a "live and let live" deal, but X could not trust that Proteus wouldn't hurt anyone else if left to his own devices. So Proteus kicked off a reality storm that forcibly fused his assailants into one body. Enemies it is, then. [Astonishing X-Men (4th series) #8]
Seeking relative privacy to express his new ideas on life, Proteus traveled to Fetters Hill, a small village in Scotland. Kevin had a unique perspective on reality because of his powers, separated not into "real" and "not real," but into what he'd brought forth and what he hadn't. The astral plane had been an environment very similar to his understanding of reality, and he wanted to bring it to Earth. To accomplish this, Proteus built a wall and defenders around Fetters Hill, while he went to work inside. He offered the people of Fetters Hill anything they wanted, and expanded his powers within the village to literally allow them to have it. In this way, Proteus crafted an experiment to see what would ultimately happen if people could have everything they wanted, all the time. [Astonishing X-Men (4th series) #9]
The X-Men followed Proteus from London to Fetters Hill, breaking down his walls to confront the psycho-reactive reality inside. Kevin presented his ideas to X as the ultimate expression of Xavier's dream. Perhaps half-mocking, half-serious, Proteus challenged that the idea of peaceful 
co-existence was based around the assumption that most people are inherently good. And, while many people in Fetters Hill acted out selfish or evil wishes, the majority of wishes and dreams would be benevolent. The frothing reality of Fetters Hill grew into a "garden" and, when it became psycho-actively charged enough, allowed Proteus to cast out new reality "seeds" to grow elsewhere over the world. Eventually, no one would have to live under the tyranny of a reality they didn't make, and the world would reshape itself into what the majority of people wanted most... whatever might come of it. [Astonishing X-Men (4th series) #10]
X and Psylocke used the psychic network previously established by Shadow King to boost their 
powers and reinforce existing reality, countering the psycho-active effects of Proteus’ reality seeds so reality remained stable at his new targets. Meanwhile, the other X-Men confronted Kevin directly. Logan and Archangel weakened him first with metal, leaving Proteus in need of energy to recharge himself and keep his energy form stable. However, Rogue was able to absorb some of his powers, allowing Bishop to get his hands on Proteus as well. The mutant energy converter was able to drain Proteus’ unique energies and metabolize them, expelling Proteus’ energy in a massive discharge that scattered his essence once more. [Astonishing X-Men (4th series) #11]
Months later, Charles Xavier and the X-Men made several new leaps on behalf of mutantkind. Mutants received a homeland on the island of Krakoa, recognized as an official nation-state by the United Nations thanks to revolutionary new pharmaceuticals and bio-technology developed on Krakoa. The new nation granted citizenship and amnesty for every mutant the world over who was willing to swear loyalty to the ruling Quiet Council of Krakoa. But the greatest discovery of Krakoa was one with which Proteus was directly involved.
An unprecedented cooperation between mutants and their powers provided the opportunity to cheat death itself. For some time, Xavier had been secretly recording mutant cerebral patterns using Cerebro, a back-up for every mutant mind on the planet, while a covert cooperation with Mister Sinister had preserved genetic samples from all these mutants as well. These ingredients were brought together for Proteus and his four new comrades. First, a young mutant called Goldballs had the power to conjure spheres of golden matter that, upon further study, were revealed to be 
eggs of compact biological material. Although unviable in their natural state, Proteus was able to bend reality in a selective way to turn these eggs into viable forms of life, making birth possible. Sinister's genetic samples for a specific mutant were injected at this point, and Elixir's bio-kinesis bonded the egg to the material, producing a genetic duplicate husk of the sample's template. Eva Bell's time-based powers as Tempus allowed her to accelerate the birth and aging process to bring the biological husk to adulthood, and the entire process was streamlined and synchronized thanks to Hope Summers and her unique ability to interface with other mutant abilities. When Cerebro's cerebral copy was added to the genetic duplicate by Xavier telepathically, an organic blank slate effectively became a reincarnation of any dead mutant. Proteus, Goldballs, Elixir, Tempus, Hope... together they became the Resurrection Five, and the cornerstone of Krakoa's growing population.
Kevin's unique needs were also addressed by the Quiet Council and the Five. His behavior and "irregularities" in the past were diagnosed as a psychological consequence of his physical bodies' deterioration. To fulfill his needs, Proteus was provided with a mindless husk grown from Charles Xavier's own genetic material to host his energy form. The Five also consistently maintained a second husk in reserve for Proteus to transfer into whenever his present body decayed, preventing him from needing to inhabit living and independent hosts as he had in the past. [House of X #5]
For the most part, Kevin MacTaggert seems content with his role in the Resurrection Five. Kevin finally has a place to belong, a purpose in life, and people who appreciate him. He made peace with his mother's ghost, and oversaw the opening of the Moira MacTaggert Memorial Hospital in Madripoor, arranged by Emma Frost of the Quiet Council. [Marauders #18] Krakoa was the beginning of a new era, but secrets at the core of the nation will threaten its future. Kevin's mother is not only still alive but a mutant herself, gifted with the ability to reincarnate across timelines. Moira's coupling with Joe MacTaggert seems to have been deliberate in order to produce an Omega-class mutant like Kevin, with Krakoa as an ultimate goal. She faked her death with the assistance of Xavier and now inhabits a tumorous No-Place inside Krakoa that only Xavier and Magneto know about. The three of them have been working towards Krakoa for decades, and their endgame is uncertain. [Powers of X #6]
It remains to be seen how Proteus might react once he learns his entire life had been even more of an experiment than he already believed.