from UXN.com - hope it helps
PROTEUS II
Real Name: Kevin MacTaggert
Universe/Timeline: Marvel Universe
Current Status: Deceased
Aliases: Mutant X, Gilbert Benson, Joe MacTaggert, Angus MacWhirter, Jamie Madrox, Ferdie Duncan, Jennie Banks
Nationality: Scottish
First Appearance: Uncanny X-Men #125
Last Appearance: X-Factor Annual #6
Cause of Death:
Chose to end his own existence after briefly returning to life
Powers and Abilities:
generate enormous amounts of psychic force from his energy state that allows him to restructure reality in any manner, can merge with human bodies to contain his vast energies
Affiliations:
none
Notes:
Proteus I was an Atlantean rebel.
Kevin MacTaggert died in Uncanny X-Men #128, and was later resurrected and bonded with Piecemeal in Uncanny X-Men Annual #15.
😄
If he was still alive, he could probably be one of the most powerful mutants. He took on the slew of X-Men including Phoenix and although vulnerable to metal, he is fully capable of taking down Magneto. Remember, Colossus only took him down when Proteus tried to posess Peter in human form when he didn't realize Colossus had [another] armored form.