Crewman cards are not considered players, but are special Characters that are used to reduce the difficulty of a scenario. Regardless of the number of players, before you start the game, you can choose 1 Crewman card.
None of the crewman cards affect the total number of players when considering Shelter, Roof, and Palisade costs or in any other case.
There are 6 different Crewman cards available in this set.

For the Artist and the Old Cook apply the same rules as for Friday, with the following changes:

both Artist and the Old Cook require Shelter, otherwise during the Night phase they receive Wounds for sleeping in the open air
Determination tokens are useless for them
the Old Cook is affected by weather
when playing with the Artist the First Player receives +1 Determination in the Morale phase
when playing with the Old Cook during each Hunting action the Beast gives the players +1 Food and +1 Fur

Pilgrim

Playing with Pilgrim each round during Action phase one of the players may re-roll one Action die of any color.
Is immune to all game effects.

Quatermaster

Playing with Quatermaster each Starting Item can be used 4 times instead of only 2 (place 4 markers on each Starting Item card at the beginning of the game).
Is immune to all game effects.

Sawbones

Playing with Sawbones any time a player heals a Wound and this makes his wound marker pass the Morale descrease symbol then increase Morale level by 1.
Has a limited life.
Is affected by Weather.
Doesn’t have to eat in the Night phase.
Doesn’t provide an additional pawn.

Tribesman

Allows you to play the game with face-up Hunting deck.
Doesn’t provide an additional pawn.
Is immune to all game effects.

Arcadia Quest: Haldor & Brenna