yagami iori
Main character in SNK's The King Of Fighters series. Introduced in The King of Fighters '95, Iori and Kusanagi Kyou have been bitter rivals since.
Iori is tied to Orochi by blood, which caused his Blood Riot form, better known as Wild Iori or Orochi Iori.
It has never been said if Iori was truly an antagonist. At times he plays a supporting role and at other times he just causes trouble.
He is often paired with Type-Moon's Tohno Akiha in M.U.G.E.N fan works.