Kyuuki

Kyuuki (キュウキ, "Kyūki") is the spirit of a tiger and is the guardian ghost of Tao Ching.

About
Although called Kyuuki, it actually has no real name, and so was instead named after Kyuuki the evil tiger god of the Shikyou Legend, because of their similar appearance.

O.S. Kyuuki
O.S. "Kyuuki" (キュウキ) Description: Ching's guardian ghost looks like Kyuuki (the evil tiger spirit from the Shikyou legend), so he named him Kyuuki. the medium is Tao Ching's Chinese Beretta bullet which has the image of Emperor Shun, the one who is said to have defeated the four evil gods in the legend, engraved on it. Kyuuki is shot from the gun like a bullet and it attacks the enemy just as quickly.
 * Shaman: Tao Ching
 * O.S. Type: Spirit Type
 * Spirit Ally: Kyuuki (animal spirit)
 * Medium used: Chinese Beretta bullet

Anime/Manga Difference
Kyuuki never appears in the anime series, although Tao Ching does.

Trivia

 * Kyuuki is the Japanese on'yomi rendering for "Qióngqí" (lit. Destitute Strangeness), one of the Four Fiends of Chinese mythology said to be opposite of the Four Saint Beasts.