Shizune Konishi
About
Konishi Shizune, a half-Japanese Christian who claims to be the Son of God, is based on Amakusa Shiro.
Nobody suspected the true mastermind of the Ise Ronins' plot to launch a crusade against the Shogunate was Konishi Shizune and his twin brother Tadane, who played everyone like a fiddle.
They're are revealed to be gleefully sadistic Psychopathic Manchilds, orchestrating a war to amuse themselves, shooting Shunjiro with a prototype pistol and torturing him, and capturing and torturing Azumi.