1. Apothecary (Doctor) - You are the village's true healer, anyone you target at night will be prevented from a (single) night kill.
2. Familiar
3. Golem (CPR Doctor) - A lumbering brute, you were built by the Apothecary to help heal patients, and when you get a really sick patient your gruff manner pays off. But when you accidentally target the healthy, your superhuman strength becomes a liability and ... you tend to crush them.
4. Possessor (Paranoid Doctor) - A friend of the Apothecary, you have the power to take over a person's body for a night, keeping them from doing whatever they would be doing. You are the functional equivalent of a jailkeeper.
5. Alchemist (Quack Doctor) - You've convinced the king you can turn lead into Gold with just a little more funding. In the meantime, you've convinced him to employ you as a healer. Unfortunately, you don't exactly have much training... You kill whomever you target to heal.
6. Stoned Philosopher (Naive Doctor) - In your philosophic contemplations, you think yourself a doctor, a healer of not the body, but the mind and soul. But in fact, you're a useless stoner and your night action does nothing at all.
7. Familiar
8.Apprentice (Weak Doctor) - You are the village's healer's assistant, and unfortunately the Familiars in the mafia don't respect you at all or feel they need you. If you unwittingly attempt to heal one of them, they'll straight kill you, not to mention cursing you and drawing a card.
9. Herbalist
For the sake of argument
Assume that this is the layout randomly proposed
9. does nothing.
8. Dies by targeting familiar raising suspicion of 9.
7 does what it wants.
6. Does nothing
5. kills 4 raising suspicion of 5
4. Stops 3 from killing 2
3. Jailed
2. Does what it wants.
1. Prevents 9 from dying.
Now assume that the familiars kill 1. Assume we lynch town today
Then on day 2, 2 Mafia, 4 Town and we're down our actual doc. Not odds Im super keen on