|“||That's right. I too love battles. I can drink as much lovely blood as I want.||”|
–Hilda to Meiya, Volume 8, Chapter 1
Hilda (ヒルダ?) is the daughter of Tooru Sayonaki (Vlad), who helped her father torture Riko Mine while she was captive. She was initially part of the Grenada faction at the start of the Far Eastern Warfare (FEW) until she was defeated by the combined efforts of Kinji Tohyama, Aria H. Kanzaki, and Riko Mine. Afterwards, Hilda became part of the Deen faction.
Hilda is a teenage girl wears a pitch black Gothic Lolita outfit with a black umbrella, black headband, black miniskirt, and spiderweb knee-socks. She has pale skin, red eyes, bat like fangs, bat wings, golden twin-tales, and tattoos similar to her father showing her weak points.
Hilda has a personality similar to Patra by looking down at people she considers commoners like Kinji to where she will not do anything asked for by him. Also, she is very bold and overconfident in herself before being defeated and becoming subservient to Riko. In addition, Hilda loves battle and drinking the blood of her victims. Plus, like Katze Grasset, she has an intense hatred for the Vatican and seeing them as ignorant.
When Hilda was young, she helped her father imprisonment, torture, and experimentation on Riko Mine. At one point, her head was cutoff by Meiya, but survived due to her regenerative abilities.