Shadow

From the Soulcalibur Wiki

The Shadows are Voldo's servants in Soul Calibur IV. They use Voldo's fighting style. In Voldo's Story Mode, he is accompanied by a shadow for the first three stages, but then the shadow is unable to continue. In Shura's Story Mode, after she defeats Voldo and a few shadows on the second stage, a shadow follows her for some unknown reason for the rest of the stages.