Answer:
It depends on the personality of the character
Explanation:
If it is a villain it should have the power "wither" (death by touch) or Umbrakinesis, or Sciakinesis, (the ability to mentally generate and manipulate darkness, the absence of light. One with this ability can even deactivate and repulse or travel through shadows )
if it's a good guy it should have the power to shapeshift or control elements
