Courtney Faraday was the niece of GPA agent King Faraday and a very lethal metahuman. Despite her differences with her uncle, he actually cared for her more than one could expect, with special care being placed into her Project Cadmus profile. Eventually, she took on the name Mercy and took to wearing gloves to have people avoid her touch and started to associate herself with Voodoo. It was through this partnership that she got involved in Futures End.
Mercy's metagene resulted in her retaining and drawing toxicity from the environmental pollutions into her own body. Lethally toxic to the touch, Mercy's own toxins had no effect on her as a result of her meta-evolutions.