Shiragane's 1st form

Shiragane is the main villain of Ninja Gaiden for the Game Gear.
He was manipulating the nations of the world into a catastrophic final war, he sought to take the Dragonsword in order to increase his ability to control minds and thus ensure the world would fall into Armageddon and lured Ryu to his lair in order to face him in battle and take the sword.

Shiragane's 2nd form

In battle he displayed the ability to hover in the air and fire beams of energy from his hands - after being lowered in health he transforms into a fire-breathing monster.
After the fire-breathing monster is defeated he morphs into another, more demonic form with the ability to emit fire from its hands and mouth.

Shiragane's 3rd form