Rulebook: SET-UP AND PREPARATION wrote:
"Each player takes two copies of each students (sic) from the Starting Class except for Keziah Mason (only one copy) and Natalie Peaslee (three copies)
This just means you take one copy of Keziah Mason, three copies of Natalie Peaslee, and two copies of every other starting character.
If you're asking about the powers, Natalie has none, and is simply used for her Girlpower and Resolve if drawn for the classroom, or 1 Nightmare point for buying faculty if she is in your hand.
Keziah has 2 Nightmare points, and a Pre-class ability, but she's worthless when drawn for the classroom. If in hand, after using her Nightmare points to buy something, her Pre-class ability can be used to remove a particularly nasty faculty in your hand from the game and swap it with a substitute, at the cost of losing her permanently.