That was Jason macendale formerly the Jack O'lantern who took the Hobgoblin ID afte Ned Leeds was framed/killed.
Macendale wanted power as he didn't have the goblin serum so he struck a bargain with a demon in the X-men INFERNO crossover.
This resulted in years of bad usage of the character until he was cleansed, then I think he became a cyborg and still couldn't cut it as Hobgoblin and was incarcerated.
Then came the Hobgoblin Lives story and all was well.
Thank you very much, cam you tell me in what issue he struck a bargain and became demonized?