Hobgoblin

Fashion designer, used questionable & ruthless business practices
Acquired the Green Goblin's original suit & equipment from a bank robber
Sought out Norman Osborn's original Green Goblin formula;
Modified the formula to avoid the insanity-inducing side effects
Battled Spider-Man, defeated & decided the direct criminal approach wasn't for him
Brainwashed Ned Leeds into thinking he was the Hobgoblin, to act as a stand-in
Assumed when Jason Macendale took the Hobgoblin identity, after Leeds was murdered
Had to kill him when he risked revealing Kingsley’s criminal activates
Reclaimed the Hobgoblin identity, past actions were discovered, went to jail