LIVING DIAMOND

LIVING DIAMOND (Jack Winters) - X-Men #39 (December 1967)

Also known as Jack O'Diamonds. Briefly mentor in crime for Cyclops. Gained additional powers after exposure to radiation. Frozen into his diamond form by Cyclops and Professor X and destroyed by a vibration beam.

CHANGELING

CHANGELING (Kevin Sidney) - X-Men #35 (August 1967)

Member of Factor Three. Posthumously recognized as an honorary X-Man. Impersonated Professor X at his request, without the knowledge of the rest of the X-Men. Killed by Grotesque while in Professor X's guise.

BANSHEE

BANSHEE (Sean Cassidy) - X-Men #28 (January 1967)

Widowed. Former Interpol officer. Father of Siryn. Cousin of Black Tom Cassidy. Member of the X-Men and Muir Islanders. Mentor of Generation X. Leader of X-Corps. Once lost powers to Moses Magnum. Longtime partner of Moira MacTaggert. Retained powers post-M-Day. Killed by Vulcan.