Entity 666

You've probably heard of entity 303 right? well have you heard of entity 666? This guy is extremely creepy I encountered him once.And It scared the shit out of me! So I was walking In the forest in Minecraft, and saw a Desert Temple in the distance. I was going to explore it and I broke the blue terra-cotta. I landed on the Pressure Plate but it didn't explode. Instead, a greenish figure fell from the sky. It killed me and when i respawned i gt back and took my loot back and when im there i saw this: Me seeing this idiot standing infront of me AFK i was pretty creeped out and when he started moving i was like oh hell nah he didnt attack me but when he moved i saw him building this a statue of null you might know null its this creepy guy that his whole avatar is black but has red eyes like this and was building herobrine too so this is the image i did not take photo but it still matches here take a look:

it pretty creepy but uhhhhh he builded that, and when he builded that he started attacking me for no reason but i do have a theories

theory 1 : hes a mob thats why hes attacking me

theory 2: i tried attacking him but i got 1 shoted

that all it il* see y6u g7ys la7ter...