Mutant X spells Mind Control

And so we reach Uncanny X-men # 127, the one where we finally meet Moira McTaggert's son: Kevin, better known as Mutant X or Proteus. Anyways: he can change reality but his mutant energies consume his physical form so he needs to body-jack others in order to survive.

He takes over their bodies and consumes their lifeforce and souls. Kevin jumped from his own form to that of curmudgeon Angus McWirther, one of Multiple Man's clones and then by way of the Scottish police officer in this picture to the girl who finally led him to his father, Joe McTaggert.

In the end, Colossus destabilised Proteus' energy form, dispersing and seemingly killing him.