Twelve Guardians

The Twelve Guardians (十二天将) are the exorcists who inherited the names and powers of Abe no Seimei's shikigami. They are the most powerful exorcists behind the Chief Exorcist and Miko. Each are a member of a house descended from the twelve allies of Abe No Seimei in ancient times.

Strength, Powers and Abilities
The Twelve Guardians are the strongest rank of exorcists.

In anime, a Guardian is as strong as 1000 Exorcists or more. It is determined that all of the Twelve Guardians are as strong as Abe no Seimei and Kuzunoha. In the Anime, They also able to perform a special ritual called Rikujin Shinka and Heavenly Blue Earth Ritual.

Succession
Some of the shikigami of the Guardians are pretty versatile at choosing successors, like Suzaku and Byakko, they simply choose at their will, among the members blood related to the house.

But in some houses succession of the Guardians are cruel. Like the Kijin Guardian, who is chosen among the survivor of ten candidates trying to kill each other, or Rikugō Guardians who must pass away to let the heir succeed, and the heir would carry all the power of deceased Rikugō Guardians, thus weakening the current Guardian's life energy.

Flight
It is said that only Suzaku's users are the only ones to have technique that enables flight. Later Keiji and Rokuro managed to use their enchantments as thrust to break that rule.

In anime, there are also Miku Zeze as Daion when she possesses her Giant Doll and Tenma Unomiya as Kijin when he is using his Sword as Hoverboard.