Seth

Seth was looking from Diego's body to the vampire in front of me. "My holy mistress, I am wiling, you know I am, but I... I seem to be," he swallowed hard enough that I heard it over the still faint ringing in my ears. I seem to be..."
"Make your sacrifice, Seth, or suffer my wrath."

(Obsidian Butterfly, page 227, paragraph 5)

* He was in the first show that Anita saw at the Obsidian Butterfly. He chose Anita out of the audience because she matched the body type of one of the "brides." He doesn't realize her lycanthrope powers.

* He offers "tribute" to the vampires by cutting his earlobe or cutting his penis with his silver knife and allowing them to drink the blood from the small wound. Anita surmises that Itzpapalotl must give her lycanthropes special healing abilities, because the anti-coagulant in a vampire's saliva should have prevented the wound from closing.

* Seth's wounds are healed almost as fast as they are cut.

* Seth is in his twenties.

* He accepted the role of sacrifice during one of Itzpapaoltl's shows. Pinotl drew out his life energy and caused Seth's skin to dry up and collapse so that in the end, Seth looked like a desiccated mummy.

* Pinotl put a jade ball in Seth's mouth and sewed it shut.