Blind the Thief

Blind was a thief who hated light of any kind. He was the boss of the dungeon Thieves' Town in The Legend of Zelda: A Link to the Past, who guarded the fourth maiden. He could change his appearance, and took the form of the maiden to try to trick Link, but if you lead him into a patch of light, he will reveal his true form.

This true form consists of what appears to be a demon covered in flame-red scales, wearing a tattered white robe. To defeat him, Link had to slash at him repeatedly until his body collapsed, and his head would continue to fly around the room, spitting fireballs at Link. Eventually the body would reconstruct, and grow a new head. Link would do this three times, causing the battle to grow in difficulty due to the multiple flying heads, until Blind was defeated. This freed the true maiden. He also leaves a Heart Container behind.

There is a character within a house in Kakariko village who references the building to being Blind's former hideout, showing that at one point, he lived in the Light World. Given that Ganon himself is described as having been a thief, and Blind guards one of his captive Maidens, it is possible that Blind is a former friend or minion of the villain. It is also theorized by others that this character is Blind himself, but this is very unlikely, and no proof is ever given to support this claim.