I think the wall murals might be the key to figuring things out.
I'm not making much of those in the art book. Perhaps those in game provide more information.
All murals from the hall of stories art book have the same pattern. A decoration on top. Left a dead King being carried by three man in robes each holding a staff and are accompanied by a single dog. Right a dead Queen carried by three woman. In the middle person that is thematically related to the top mural.
1. On top a boat with 4 persons inside. Three are rowing. One of them is throwing a spear at a giant whale. The man in the center is wearing a horned hood and is holding two spears and has a necklaces of bones. In the background there is water (the sea) and high cliffs. My first impression is hunter.
2. On the top is a Dragon. The man has a halo of flames, these seem to be originating from two small daggers in his hands. His clothing has lots of folds as if they are scales. The overall aesthetic says Dragon Priest.
3. On top is a head which has two braids that look like serpents going of to the left and right. The man himself is wearing a head cover that looks like a cobra. He has serpents crowling around his arms and waste. Left and right are two stacked stone towers with more serpents. A minature man is standing on the bottom stone fighting a serpents.
4. On top a moth with it's wings spread out. The woman is standing in front of what might be a tree. Moths are flying up from her hands.
5. On top a fox, flanked by bushes/shrubs. The man is holding two weapons. They could be the lower jaw of some animal attached to a leg bone. He also appears to be wearing a fox mask.
6. On top a wolf, flanked by pine tree branches. The man is holding two staffs with on top what appears to be the skull of a large canine (wolf?) Above his head is a skull with branches growing from the eye sockets, on the left branch sits a bird (crow like).
7. On top an Eagle as seen when looking up against it's attack. Th woman underneath has a halo of feathers and her clothes contain feathers too. She's also dropping two things vaguely star like.
8, On top an Owl as seen when looking up against it's attack. Flanked by a star and cresent moon on both sides. The man has a halo of wings and the bottom cresent of the moon floating over his head. Left and right eagles are flying from three stars to one.