The nameless one is a large skeleton. It wears a crown of some unknown material over a robe and a belt. It has glowing dark green eyes and has robes with green translucent smoke coming out from underneath it, as it has no legs. Its ribs go over a robe which is remarkably similar to that of a witch. It was originally the ruler of an ancient civilization of necromancers.

wiki page https://minecraft.fandom.com/wiki/Minecraft_Dungeons:Nameless_One

note: EmptyCoso its me becouse i have 2 nicknames