this is 6-ff a weird entity who spawns in a room behind your current room, he makes the sound heard here and suddenly a gummy sword will appear, and if you attack him with the weapon then he shoots the rainbow eye lazers it does 1 dmg per second, but if you spare him, he will follow you and warn you of entities. but he also acts like Noah, so basically he helps you but damages you in return. If he sights 9-II he will die making a loud scream. HE GETS MAD IF YOU KILL HIM!!! SO EXPECT HIM TO BE MAD WHEN YOU MESS WITH HIM AFTER YOU RESPAWN HIM!!
all by me