Grigori

Grigori is Diva's second chevalier, based the historical figure, Grigori Efimorich Rasputin. He does not appear in the anime in his original form but assumes the identity of Sonya. In the Blood+ Adagio manga, he has one of the leading roles as the Imperial Monk or Healer of the Romanov empire in Russia.

Appearance
On the anime series, only a photograph of original Grigory is shown. He appears to be an old, bearded man with serious demeanor. However, in the manga version, Grigory is shown at a much younger age. He has long, straight hair and has handsome features. He wears black uniform while in imperial service and dons a white habit within his cult.

Personality
Grigory was also called the 'mad monk'. His reactions were unpredictable. He was popular among women especially the Tsarina. Tsarina Alexandra entrusted Alexei to him for healing and demanded his presence and advice on everything. Salacious details of his general conduct, fed and exaggerated by his many ill-wishers, became the subject of public scandal.

Skills
Grigory was a skilled researcher. He is the one to first develop chiropteran drugs in attempt to create chevaliers. He gained the trust of people as a healer and conducted experiments on them under the guise of treatment. His research materials were taken by Amshel after he was thrown away.

Chiropteran Powers
As a chevalier, Grigory had enhanced strength, speed, regeneration  and transformation abilities.

Anime Plot
Only briefly mentioned during the series, he performs the death of the real-life figure and uses his powers to assume the form of a young girl named Sonya, taking refuge in a village near his hometown. In 1918, Saya and Hagi meets Grigory in a Russian village; he was assuming the form of Sonya. Through the discovery of a letter at Sonya's house, Hagi finds out that Grigori was helped to some extent by Sonya and her father. When Grigory reveals himself as a chevalier, he is killed by Saya. Before that he had helped Diva to escape.

Blood+ Adagio
Adagio explains the history of Grigori and Diva. At some point Amshel or Diva chose Grigori to be her chevalier. He likely helps Diva assume the identity of the daughter of Tsar Nicholas II, Grand Duchess Anastasia. It is also hinted Grigori is cajolling Tsarina Alexandra. He forms a secret cult centered around gaining immortality through the blood of a chiropteran queen. He tries and fails to convert Hagi to his side. Diva casts Grigori aside as her chevalier despite his pleas and tells him she'll make the Romanovs' youngest son Alexei his replacement, causing a desperate Grigori to plead with Saya to be her chevalier. Later, Prince Felix and Grand Duke Dmitri trick him and try to kill him; the true mastermind behind the assassination attempt is Amshel. However their poisoning plan fails. Then Amshel emerges, continuously shooting rounds of bullets to make Grigory bleed profusely, hindering his regeneration. Eventually he is thrown into the cold waters of a Russian river. Grigori survives Amshel's attack with grave wounds. He washes up on a shore where a girl called Sonya finds him. He mistakes her for Diva in a moment of desperation for Diva's love, setting up the scenario for him to kill Sonya and her father and take on the girl's identity, most likely in attempt to hide from his enemies, including Amshel.

Trivia

 * Although his name is rearranged and spelled a bit differently here (Gregory Rasputin Efimovich), Grigori Rasputin (known as Rasputin, the Mad Monk) was an influental figure in Romanov politics and even influenced Czar Nicholas II to an extent.
 * In the English dub of the series, his name is changed to Gregory.
 * Rasputin was a healer who used strange experimental medical techniques such as leeches and hypnosis. Similarly, the figure in this episode explored medical areas as well to create artificial humans.
 * It is possible that Grigori Rasputin might be Gregory Efimovich: Hagi noted that Efimovich was alledgedly assassinated in 1916; in reality, Grigori was poisoned by military officials in 1916 and died in St. Petersburg.