A goddess who can transform into both a holy god and an evil god. Whichever way she transforms, she possesses great power and overpowers those who oppose her... She has the ability to redeem all things through destruction and elevate all things to godhood.
Depending on the viewer, she can be seen as either hope or despair.
Mainyu itself has no concept of life or existence, so no matter how much it is repelled, it will eventually attack again. Despite being a female, she has a creepy male voice.