SPOILER WARNING
"Fetcher" Farley:
On Fetcher´s Rest. West hill of the island, on top there is a gate and behind it there is a chair and a book (unreadable). Turn around at the gate and face down the hill. You should see Fetcher leaning against a rock on the right side.
"Flintlock" Bert:
On Flintlock Peninsula. North side of the island, on the peak of a rock hill there is another platform with a chair on. From here jump down to the North-West shore. You should find him there, smashed against the rock you just jumped down from.
Ruby Carter:
On Ruby´s Fall. Middle of the Island. She is lying under the wooden bridge that connects the two big hills.
Old Coop:
On Devil´s Thirst. The bigger part of the island (not the Vulcano). Big hill on the east facing north. Go all the way up. On the top he lies, in front of the jaw of a big shark.
Hepzibah Jones:
On Forsaken Brink (Small Island). Middle of the island. He is lying in a small shelter.
