Shocker

Self-taught engineer & renowned safe cracker
Invented gauntlets capable of producing powerful vibrational shock waves;
Incorporated them into a protective battlesuit, became a mercenary for hire
Quickly rose in New York City's criminal underworld, employed by various crime lords
Often fought with & was defeated by Spider-Man
Sought wealth & a comfortable life rather than revenge or chaos
Sometimes helped Spider-Man or other heroes when it was in his best interest