This skin relates to Underground Creatures! It is a miner who went mining one day, and came across diamonds. You will see the story soon. Anyway, it is a miner who has been abandoned. It isn't sure which life form it is; a cross between a human and a skeleton.
Story
He was mining, was my old friend. He mined and he mined and he mined with me. We were so low, must of been near the bedrock; around 11 in our Y coordinate. We were in a cave... it was dark and bats ruled the corners. Creepers and zombies held their ground and skeletons were to be avoided as they would shoot from afar.
Finally, we came across diamonds. He went to mine the ore with his fortune pickaxe of which only he had. This is why he had the job to climb and clamber acorss the deep hole. He started mining, but it went terribly wrong. He fell into the deep, dark and unknown place. I couldn't go there. If I did follow, we would both be dead. I had to abandon him, and you can guess what happened.
When I reached safety my buddies found him and confirmed him dead. Above is all that was left of poor old him. You could wear him anywhere, like I sure do. His heart will stay with me.