Himegami was Nagi's butler before Hayate. He has yet to make an appearance in the manga, but judging from the way Nagi and Maria speak of him, he quit due to a problem related to Nagi's personality traits. Neither Nagi nor Maria seem to want to elaborate on his departure. Also with references from the first volume he was close to Nagi. He wrote a book on how a butler can acquire a one-hit kill technique, but later Nagi burnt the book. Maria addresses him with the title "-kun", which means he is probably around Hayate and Maria's age. He also insists that he be called "Princess God" (in English) rather than Himegami, which is coincidentally a direct translation of his surname.

(Source: Wikipedia)