Shadows???

Has anyone seen a version of their skin but with a gray, white, black, and purple? i have found mine in the end. i Killed The Ender Dragon and then I saw me but with that color pallet. then i had a battle with him and i died and it said "AetherGaming has been killed by Shadow_AetherGaming". i looked in the code and found nothing. Then I Was Playing Agian and saw him again but with 2 other "Shadows" Shadow_spikeyboy11 And Shadow_GhostRider512