Once the brilliant leader of the Mavericks, now borderline senile, little more than a shambling wreck with a feverish rage (especially against X or Zero). His sanity degraded by being continually destroyed and resurrected, resulting in this incompletely restored body, resembling a zombie more than anything else, fighting with sluggish but powerful attacks. If this body gets destroyed, Sigma will emerge in a gigantic unfinished body called Hell Sigma, with limbs that are attached to the ground