Filthy was an actual player last time unownDB saw him. Before he became a piece of X, he was an observer along side Persolus and Observer1. He actually committed suicide by shooting himself in the head with a pistol. He has the ability to edit memories of other denizens and can test possible futures by deliberately acting like he was going to do something, he killed himself to prevent these abilities from being used anymore. We are not certain if his death was just a ruse by X or not.