To the best of my knowledge, Dominika is the Original Creation of SymphonieDN of DeviantArt found here: symphoniedn.deviantart.com .
She is a warlock from World of Warcraft and absorbed some demonic artifact similar to Illidan with the Skull of Gul'dan. That's essentially the reason for her corruption. She's a demonology warlock. Nuf said.
Not completely sure if Hentai Foundry user 'Dominika' is the same individual.