I would say Partygoers, but I am still holding out hope they can be written better. When I first read about them, they gave me John Wayne Gacy vibes. I do not understand the roleplay... they are dangerous entities. Nothing on their page suggest they are friendly.
Partygoers would be ontop of everyones list because of the roleplayers. But there is another entity that sucks called "Teddies". That page doesn't fit in with the backrooms and it copies a roblox game called "BEAR"