Did you ever hear the tragedy of Darth Mercy the wise? I thought not. It's not a story the genji mains would tell you. Its an Overwatch legend. Darth Mercy was a dark lord of the supports so powerful and so wise that she could influence her ultimate to create life… She has such a knowledge of healing that she could even keep her teammates from dying… Being a support main in Overwatch is a pathway to many abilities some consider to be unnatural. She became so powerful… The only thing she was afraid of was Being killed, which eventually, of course, she was. Unfortunately, her team already had another healer, then a tracer killed her away from her team… Ironic, she could save others from death, but not herself.

I'd say make her skin hair and eyes just a shade above pure white, pale like a cancer patient or corpse. Maybe ditch the mask too because it'd be better to see the once loving and caring face of mercy twisted into an expression of purest evil.