Ambrosia

Ambrosia (アンブロジァ, Anburoshia) is the Dark God of Makai (Demon World) Amakusa and Mizuki were trying to revive.

Game Appearances

 * In Samurai Shodown (Amakusa's stage) Ambrosia had the form of an anthropomorphic, winged and horned being with a skull in place of its face.
 * In Samurai Shodown II (Mizuki's stage) the Egg of Destroyer a giant sphere with an infant child inside and eye symbol on the surface located in the background. When Mizuki is defeated, we see Ambrosia disappearing into darkness, this time as a green fanged skull with purple glowing eyes and a symbol on its forehead.
 * In Shinsetsu Samurai Spirits: Bushidou Retsuden, Ambrosia appears as a being compiled of a grotesque mass of flesh, and is the final boss in the game.
 * Ambrosia and Mizuki make a cameo in a bonus stage for KOF: Maximum Impact 2. It reenacts Mizuki's stage in Samurai Shodown II.

Anime Appearances

 * Samurai Shodown: The Motion Picture
 * Samurai Spirits 2: Asura-Zanmaden (OVA)

Speculations
There are also many speculations about Yuga the Destroyer being Ambrosia because:
 * they arguably fill the same spot in storyline (as mightiest villain/demon from Makai (Demon World). They both want to invade and conquer the Human World, but cannot leave Makai.
 * they share the same eye symbol.
 * in Asura Zanmaden OVA, the cracking of the Egg of Destroyer was shown as a symbol of Yuga's entry to the human world.
 * the Egg of Destroyer shows an infant inside it and infants were the key point in Yuga's preparations to invade in the human world.

When fans pointed out the similarities to developers, they replied that the two characters' relation to one another is unknown.