Orochi is the legendary 8-headed snake from japanese folklore. A beast similar to
Tiamat.
Also, he is a protagonist in
Koei's Musou/Warriors Orochi franchise: Created a warped world and trapped warlords from the three kingdoms of ancient china dynasty warriors/ sangoku
musou and the warring states of japan samurai warriors/
sengoku musou with the help of Da Ji, a supernatural anthropomorphic fox based on the concubine of King Zhou of the Shang dynasty.
Orochi is also a villain in the King of Fighters series - this time
orochi is an evil force sealed by the
Yagami and the Kusanagi clans 1800 years prior to the events in the game King of Fighters '97. He reappears at the neo-geo crossover game Neogeo battle coliseum" under the name of Mizuchi, a clone of the original Orochi made by WAREZ, a fictional corporation which is leading a tournament to take over Neogeo world.