Guillermo de la Cruz es un vampire killer, familiar y guardia de seguridad de Nandor the Relentless. También fue el padrino de su boda. Guillermo is Nandor's best friend and codependent partner in fighting crimes. Guillermo as far as we know remains humans after rejecting vampirism. Nandor told him he is something better: a warrior.

Nandor the Relentless is 700 years old vampire from Al Qolnidar. He was a warlord and a viceroy before he was a vampire. He is also bisexual and brat. Contrató a Guillermo por un aviso en craiglist when Guillermo was 17 years old. Desde ese entonces han sido dos amigos, enemigos, exes, boss and employee and always completely crazy about each other.

Nandermo is a product of a decade and a half of a human and vampire (un)living together in the vampire mansion. Guillermo was his servant, his familiar but also the friend of a lonely and sad Nandor. Together hey have fun adventures, kill people and vampires and create chaos wherever they go. The last time we saw them Nandor se llevó a Guillermo en su coffin hacia la guarida que contruyó para alejarse de las cámaras and fuck in peace.