Better to call it a demon:
Wither skeleton with an elytra, sheild and sword
Note: Minify the command to avoid issues :)
doom jockey
Troll's Creeper spawner (Nuclear Creeper)
GIANT JOCKEY! (Giant riding Ghast)
Fist of Fire
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)