Demise first appeared after an event which came to later be known as "The Breach of Demise". The mythology of the event depicts Demise as a horned figure with red and black coloration.
Sealing
After a battle with the goddess Hylia, Demise was sealed at the site of the Temple of Hylia and the surrounding area became known as the Sealed Grounds. The Sheikah were charged with watching over the seal on Demise until she returned[1].
The Imprisoned
While in captivity, the weakened Demise took on a different appearance as a more primitive beast. This form is known as The Imprisoned.
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The Imprisoned
Defeat
During the events of The Legend of Zelda: Skyward Sword, Demise was first defeated by a wish on the Triforce by the Hero of the Skies. Demise's sword spirit Ghirahim succeeded in traveling to the past, where he used Zelda to resurrect Demise. At that point, his form was more humanoid in nature, donning flaming orange hair and black scales over his body.
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The Demon King Demise
The Breach of Demise
One dark, fateful day, the earth cracked wide and malevolent forces rushed forth from the fissure. They mounted a brutal assault upon the surface people, driving the land into deep despair... They burnt forests to ash, choked the land’s sweet springs, and murdered without hesitation. They did all this in their lust to take the ultimate power protected by Her Grace, the goddess. The power she guarded was without equal.
Handed down by gods of old, this power gave its holder the means to make any desire a reality. Such was the might of the ultimate power that the old ones placed it in the care of the goddess. To prevent this great power from falling into the hands of the evil swarming the lands. The goddess gathered the surviving humans on an outcropping of earth. She sent it skyward, beyond the reach of the demonic hordes. Beyond even the clouds. With the Hylians safe, the goddess joined forces with the land dwellers and fought the evil forces, sealing them away. At last, peace was restored to the surface.[2]