You always start out with the package, half-drowed health, and memory of a Storm. Inspect your package, you get three memories, associated with Soul cards: Shapt, Fet, Chor. You can inspect your package with these, and they will say that what remains of you is Words, Dreams, or Instinct respectively.
Shapt -> Wist - Sand-Scarred Journal. The Archaeologist. Mystery: Winter. Skolekosophy (knock-winter-grail)
Shapt -> Ereb - Bee-Silk Journal. The Artist. Mystery: Grail. The Bosk (moth-heart-grail)
Shapt -> Mettle - Sand-Scarred Journal. The Archaeologist. Mystery: Edge. Skolekosophy (knock-winter-grail)
Shapt -> Phost - Amber-Flecked Journal. The Twice-Born. Mystery: Lantern. Illumination (forge-lantern-edge)
Fet -> Wist - Silver-Bound Journal. The Magnate. Mystery: Winter. Hushery (edge-lantern-winter)
Fet -> Ereb - Bee-Silk Journal. The Artist. Mystery: Grail. The Bosk (moth-heart-grail)
Fet -> Mettle - Ironclad Journal. The Revolutionary. Mystery: Edge. Horomachistry (forge-edge-worm?)
Fet -> Phost - Serpentskin Journal. The Cartographer. Mystery: Lantern. Nyctodromy (moth-lantern-knock)
Chor -> Wist - Feather-Decked Journal. The Symurgist. Mystery: Winter. Birdsong (moth-heart-worm?)
Chor -> Ereb - Bee-Silk Journal. The Artist. Mystery: Grail. The Bosk (moth-heart-grail)
Chor -> Mettle - Horned Journal. The Executioner. Mystery: Edge. Preservation (heart-grail-worm?)
Chor -> Phost - Hammered Copper Journal. The Prodigal. Mystery: Lantern. Ithastry (forge-winter-knock)
Of particular interest: the Twice-Born used to be a Lantern long who reincarnated as a being of flesh again. The Prodigal was born to two Long (aka, the Crime of the Sky) and is fleeing his parents. The Executioner used to work for the Suppression Bureau but feels guilty about all the monsters he slew. So, in Book of Hours you're generally playing as someone potentially already very versed in the occult, which is fitting since a lot of players are already going to have played Cultist Simulator and recognized a lot of this stuff.
The Artist seems to be the most common option (and possibly the most mundane / open-ended), since it always comes up if you go Ereb. Then the Archaeologist, which you have a 50% chance of getting if you chose Shapt first. The Artist might be analogous to the Aspirant from the original CS.
I have a question mark after Worm because it's blacked out and marked with a Suppression Bureau stamp in the Tree.
The friends you get offer a free Assistant for a day (as many times as you like), at the cost of a Soul card (but no money). The friend you get is based on the second Soul card you chose.
Wist - Mr Kille - 2 Winter, 1 Sky
Ereb - Mrs Kille - 2 Grail, 1 Heart
Mettle - Denzil Smith - 2 Forge, 2 Edge
Fet - Reverend Timothy - 2 Lantern, 1 Knock
Soul cards have the following associated principles:
Shapt: Knock (2), Forge
Fet: Rose (2), Moth
Chor: Heart (2), Grail
Wist: Winter(2), Lantern
Ereb: Grail (2), Edge
Mettle: Forge (2), Edge
Phost: Lantern (2), Sky
Trist: Moth (2), Moon
Health: Scale, Nectar, Moon
Health, you have at the start and recover it. Trist, you get no matter what once you start on the Tree of Wisdoms.
If, at the start, you let the timer on your health go down, it goes from Half-Drowned to Freezing, and another timer starts. But then it just becomes Freezing again. There's no secret achievement for dying on the beach. What the fuck, Alexis?