Vigo is often mentioned in descriptions and the names of Unlockables.
He was an Inventor and a Researcher. He extensively studied The Entity , especially its biological and organic aspect, alongside its Realms, to the point that he was able to create new contraptions from The Fog, both mechanical and magical.
It was potentially him who created the Black Lock as it is known that it was not created by The Entity.
It is known that he owned a Laboratory hidden somewhere in the Realms of The Entity.
It is unknown what happened to him other than that he is no longer a Survivor in the Entity's Realm.