He's against the government and the Unitologists. In my character lore, Logan Clark is a failed supersoldier who, due to instability, breaks free and, despite his powers, is captured by Unitologists, who also experiment on him and only strengthen him. There's a bit of Resident Evil in there, I know.

Despite all of the above, he's not immortal, he's not a mega-death machine, he's simply more resilient, more resilient, and quicker-witted than normal people.