Kidō Corps

The Kidō Corps (鬼道衆, kidōshū) is a separate branch of Soul Societies Army that excels in the art of Kidō (Demon Arts). It takes students from the Shinigami Academy that excel in Kidō and trains them to further their abilities in said area. Its operations are executed in absolute secrecy, little else is known.

Notable Members
It has been revealed that the leader of Kidō Corps also has the title of Captain, and is treated on equal terms with the Gotei 13 Captains. Just like the mentioned Captains, he or she also has a Lieutenant as a second-in-command.

Current
The current Kidō Captain and Kidō Lieutenant for the Kidō Corps is unknown at this time.

Former
Former Kidō Captain
 * Tessai Tsukabishi

Former Kidō Lieutenant
 * Hachigen Ushōda

100 years before the main storyline, Tessai Tsukabishi was the Captain of the Kidō Corps, with Hachigen Ushōda as his Lieutenant. They were both forced into exile at this time for committing crimes against the Soul Society. Tessai's crime was using forbidden Kidō spells while Hachigen's crime was illegally acquiring Hollow powers.

Special Duties
The Kidō Corps is responsible for opening the senkaimon (穿界門; lit. world penetration gate) between the human world and Soul Society.