TV-Series
Description
Mitaki Onezaki is a supporting character in the anime Black Blood Brothers, also referred to as Mitake Onezawa or Mitaka Onezawa. He serves as the chairman of the Order Coffin Company, often called the Company, an influential secret organization that effectively oversees the Special Zone, the secret city where vampires and humans coexist. In this role, he is responsible for the creation and administration of the Special Zone, acting as a mediator between the two species and ensuring their fragile coexistence is maintained. He is a human, not a vampire, but holds a position of significant authority within the vampire community.

Onezaki is a high-ranking member of the Special Zone Council's security team and is dedicated to protecting the city of Hong Kong from rogue vampires and other supernatural threats. He is regarded as one of the most skilled and formidable vampire hunters of his generation, carrying a fearsome reputation and a fierce determination to eliminate any trace of vampiric corruption in the world. He was a veteran of the Hong Kong Crusade, the war against the Kowloon Children, and fought alongside both humans and vampires to defeat the Kowloon King. He has gathered around him a group of experienced individuals, both human and vampire, who assist him in managing and protecting the Special Zone.

Onezaki is characterized by a reserved, analytical, and intellectual demeanor. He is highly introspective and self-reliant, often preferring to work alone or think through situations before acting. His nature is calculating and strategic, and he possesses a deep understanding of vampire physiology, mythology, and weaknesses. He is fiercely loyal and compassionate toward those he trusts, though his imposing reputation and competitive spirit can make him seem distant. His primary motivation is to safeguard the peace and order of the Special Zone, serving as a buffer between the human world and the hidden society of vampires.

Key relationships include his bond with the protagonist Jiro Mochizuki, a vampire of the Sage's bloodline and a hero of the Hong Kong Crusade. Onezaki eventually becomes a crucial ally to Jiro and his younger brother Kotaro in their battle against the surviving Kowloon Children. He also commands and coordinates figures such as the mediator Mimiko Katsuragi and fellow veteran fighters like Zelman Clock. His role is that of a strategist and authority figure, working behind the scenes to orchestrate defenses and enforce the laws of the Special Zone.

Onezaki is described as having been trained from a young age in the ways of vampire hunting, acquiring formidable combat skills and extensive knowledge of vampire nature and weaknesses. He is also said to possess powerful psychic abilities that allow him to detect and neutralize supernatural threats. His combat capabilities are further enhanced by specialized silver weapons, which can pierce even the toughest vampire hide and cause devastating damage. However, some of these abilities, such as the title Silver Blade and the use of a silver-coated katana, are more commonly associated with the vampire Jiro Mochizuki, indicating that descriptions of Onezaki's powers may sometimes be conflated with those of the protagonist.

Throughout the story, Onezaki's development involves the internal struggle between his duty as a vampire hunter and his growing trust and friendship with vampires such as Jiro. His character represents a rare combination of imposing strength, strategic cunning, and deep compassion, making him a complex figure within the narrative. He is a key operator in the ongoing battle against the Kowloon Children and the preservation of the Special Zone as a sanctuary for both races.