At a glance he is obviously super strong and has either true invulnerability or an insanely high degree of regenerative healing. His endurance is Unearthly. As previously mentioned, he can teleport and the range is unbelievable. The telltale signature of his teleport is an implosion to explosion, exit to entrance. The devastation of his teleportation is possibly due to how far he can teleport and the energy required to do so.
He does appear to have some limited telepathy because anyone that hears his ubiquitous self-naming scream tends to hear it in their native tongue. Along with that is the fact that he seems to be able track a target anywhere, across any distance.
Like the boogie man, don't say his name, be it once or three times, or else you may come face to face with...DA GAMMA-MAN!
Art from the early 1990s byNelson Marty