Since Itagaki was a huge fan of Leiji Matsumoto's work during DOA2's development, it's very likely that Helena's design is based on Queen Emeraldas from Galaxy Express 999.
Presenting the Kisugi Sisters also known as Cat’s Eye in their Dead or Alive Style!!! We’ve got Kasumi as Hitomi Kisugi, Ayane as Ai Kisugi, and Momiji as Rui Kisugi!!
Mod created by segadordlinks
https://www.deviantart.com/segadordelinks/art/DoA5-Mod-Cat-s-Eye-800681234
Here is this interesting Dead or Alive 5 Mod for Helena Douglas cosplaying as Cindy AKA Dr. Z from the early 80s anime film, Golgo 13 The Professional. Originally this mod was created for me by funnybunny666 which unfortunately could not get the bottom separate part of the dress to move. So for...