Ou Ki, more commonly known by his epithet - the Monstrous Bird of Qin, is a central protagonist and later posthumous character in the historical seinen anime and manga series, Kingdom. He was a Great General of the State of Qin and former member of the previous generation of Qin's Six Great Generals as well as the leader of the fearsome Ou Ki Army that was famous for their incredible combat prowess and ability to turn into Death gods whenever they were led by him personally while on the battlefield. Ou Ki was one of the greatest military figures of his era as he achieved victories that numbered in the tens of thousands, fought numerous battles with many formidable foes like the Three Great Heavens of Zhao's Ren Pa and Rin Shou Jo, buried over thousands of foes before his death.

Initially introduced into the story as an antagonist of sorts, Ou Ki quickly became one of the series' biggest forces within the story.