Augusta Vradica
from Trinity Blood
Augusta Vradica is the Empress of the New Human Empire. Her real name is Seth Nightroad. She is the youngest of the Nightroad siblings, and the third Crusnik. A member of the Alliance Aerospace Navy, Seth viewed Lilith as a mother figure and holds Abel in great sisterly affection. Among the four Crusnik siblings, she has spent the most time with Methuselah, but like Abel, she does not feed on them. As the Empress, Seth is seen as a mother by her people, and treats her subjects as she would her own children. However, most of her courtiers and servants have never seen her before in all the centuries that they have served her, mainly due to the heavy veils she wears to cover her appearance as well as the use of a voice modifier. It is implied that she does not wish to declare war on the Vatican territories due to her brother's support of the humans. As his sister, she knows Abel very well, and has commented that he is quite popular with the girls for some unknown reason. When her Crusnik powers are activated, Seth's eyes turn red, her lips turn greenish-blue, her voice becomes deeper, wings styled like fairy-like prop from her back and a pair of giant tuning forks made of blood materialize in each of her hands. In this state, she can almost instantly disintegrate her enemies. Similar to Cain, her power appears be based on a manipulation of sound waves. She calls her technique "The Fire of Sound".

Trinity Blood
The background is in the distant future after the destruction brought about by Armageddon. The war between the vampires and the humans continue to persist. In order to protect the humans from the vampires, the Vatican has to rely on other allies to counter the situation. The protagonist, Abel Nightroad, is a traveling priest from the Vatican and a crusnik, a vampire that drinks the blood of vampires. He is a member of the "Ax", a special operations group led by Cardinal Catherina Sforza. He encounters a young girl called Esther, who decides to go with him to Rome and train at the Vatican. Soon after he meets her, the order of Rozencreuz, led by Abel's twin, Cain, tries to continue the war so they can rule the world. It's up to Abel and the AX to try and stop them.