Zeoticus Gremory

Lord Gremory is the current head of the Gremory Clan. He is the father of Rias Gremory and Sirzechs Lucifer and grandfather of Millicas Gremory.

Appearance
A middle-aged looking man with long crimson red hair that is tied as a lose ponytail with a black hairband. He has bright blue eyes just like his two children, Sirzechs and Rias Gremory. He also has a short and red beard or stubble.

Personality
Coming from the Gremory Clan that has extra-ordinary affection, Lord Gremory has demonstrated a very kind disposition.

History
Little is known of Lord Gremory's past, except that he married Venelana Bael and eventually fathered two children: Sirzechs and Rias. When Sirzechs became the Satan, "Lucifer" and lost his right to become the Head of the Gremory Clan, Lord Gremory made an arrangement with the Phenex Clan for his daughter to marry Riser Phenex at some point before the series.

The Red Dragon Emperor's Awakening
He first appears in Volume 2 at Rias' engagement party and was shocked at the sudden appearance of Issei Hyoudou that is set up by his son. After Issei beats Riser Phenex, he has a conversation with Riser's father, Lord Phenex, apologizing to him and Riser for the results of the match as well as the broken engagement (although Lord Phenex didn't really mind).

Birth of the Breast Dragon Emperor
Lord Gremory reappears in Volume 4, where he and Sirzechs went to the Kuoh Academy for Rias' class observation day. He appears again in Volume 5 when Rias and her peerage return to the Underworld.

The Heroic Oppai Dragon
In Volume 12, Azazel recalled a conversation that he had with Lord Gremory, in which he told Azazel that he sometimes questioned himself as to whether Sirzechs could actually be called a Devil. When asked by Azazel as to what he meant, Lord Gremory states the Sirzechs is a mutation of a Devil and that Sirzechs, Ajuka, and another unnamed individual are the only Super Devils of the Underworld. He also added that perhaps it was Sirzechs and Ajuka's destiny to become Satans because there is no other post for the two of them to have.

Powers & Abilities
Magic Talent: Lord Gremory has been stated to have exceptional abilites in the use of Gremory magic.

Trivia

 * Lord Gremory's only known peerage member is his Bishop, Heinrich Cornelius Agrippa.
 * He acts as the mascot character "Gomorin" to represent the House of Gremory.
 * In both the light novel and manga, he and Lord Phenex discuss about the Welsh Dragon and the impending arrival of the Vanishing Dragon, while in the anime this conversation is held between Sirzechs Lucifer and Grayfia Lucifuge.
 * In Volume 14, Rias mentions that Lord Gremory has a pact with a Magician.
 * Venelana reveals that Lord Gremory has a harem and Venelana manages it.