D-Man
Demolition-Man (D-Man for short) started as a wrestler who had his strength artificially-enhanced. He met & helped Captain America with an investigation and took his own costumed identity, with a costume made from a combo of the early Daredevil outfit and Wolverine's yellow outfit.
D-Man helped Cap in a few adventures but never quite made it as a big-time super-hero. Eventually he ended up as an amnesiac in Zerotown, a refuge for homeless outcasts. When his amnesia cleared, D-Man stayed in Zerotown as their protector and provider.