Otto Octavius (Earth-81616)

Otto Octavius is a scientist and super soldier, who swapped bodies with Peter Parker (AKA USAgent), but remained trapped when Peter died.

USAgent
When Peter Parker decided he wanted to swap bodies with someone with no identity in the Fury Nation files in order to go undercover, Otto stepped forward. After a number of tests, he was put forward and their brainwaves were switched. Peter, in Otto's body, went to new York, while Otto, in Peter's body, acted as USAgent in the United Kingdom. When the day for him to go back to his body came, he learnt that his had been killed by Victor Creed, and he was left in Peter's body, permanently.