As usual, you can post your guesses for the answer to the riddle in the comments below. But for contest-related businesses, please post a comment on Deimos’s domain and he will clear things out.

And now, without further ado, the riddle:

I do not exist, yet many have known me for almost a decade.
About the past, I was once good. Very evil, totally brutal I am now.
Mentioned within the Demon’s domain, I was.
Sharp and pointy objects, my title rhymes with.
An actor as a protagonist in a popular TV series shares my name.
Revered for vanquishing beings that are dead yet not quite dead, she is.
Also, her physical beauty quite matches with my own.
Hell be damned, now tell me – Who am I?