Better to call it a demon:
Wither skeleton with an elytra, sheild and sword
Note: Minify the command to avoid issues :)
SECRET WIZARD VILLAGER
Hell sythe
headless horseman boss
be like a zombie pig-man poition
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)