Xiahou Yuan

Xiahou Yuan (夏侯渊) or style name Maio Chi is the Guardian Spirit of Cao Yan Bing.

Spirit Army Arc
Xiahou Yuan is introduced along side Xiahou Dun, when Cao Yan Bing asks them to comply with him, to aide him in his battle.

Trivia

 * Xiahou Yuan is based upon the historical figure of the same name.