Otto Octavius (Earth-4678)

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

- Doctor Octopus

Otto Octavius, also known by his media nickname Doctor Octopus, is a highly intelligent scientist, who co-founded the mega-corporation Oscorp Industries 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. Otto became a friend and mentor of Peter Parker and was secretly aware of his activities as Spider-Man. Peter served as his lab assistant at Octavius Industries, which relies on grants. There, he and Peter were on the verge of perfecting advanced prosthetic limb technology, motivated by a neurological disorder Otto is developing. After their grant funding was shut down by Norman exploiting his position as Mayor, Otto was inspired to seek revenge on him. Working on a set of mechanical appendages, 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. As Doctor Octopus, he then forms the Sinister Six as part of his violent master plan to destroy Norman and his empire.

Source

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