Otto Octavius (Earth-2731)

"For the first time on my life, I don't feel like a failure. I feel like me!"

- Doctor Octopus

A brillant scientist, Dr. Otto Octavius co-founded the mega-corporation Oscorp with his close friend Norman Osborn. He left the company after Norman committed several safety and ethical violations, later founding his own organization Octavius Industries. A friend and mentor of Peter Parker, he and Peter were on the verge of perfecting advanced prosthetic limb technology, motivated by a neurological disorder Otto is developing. However, Otto gradually lost control due to a defect with the neural implants affecting his mind and personality, and eventually transformed into the villainous Doctor Octopus.

Source

 * https://marvels-spider-man.fandom.com/wiki/Doctor_Octopus