The Reaper!
Note: Minify the command to avoid issues :)
NOTCH in Minecraft!
SKY CYCLOPS! Companion of Zeus!
SLENDERMAN IN MINECRAFT NO MOD
CYCLOPS THAT EATS VILLAGERS!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)