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.