Character: Power Man (Luke Cage)
Falsely imprisoned, he received an experimental treatment that gave him super strength and diamond-hard skin.
Long-time partner of Iron Fist in one of my sentimental most favorite series of all time.
Luke Cage 1992 trivia here.
POWER MAN AND IRON FIST #125 (1986): Series ends
The death of Iron Fist was only part of what made this issue great.