When an Alchemist uses their non-coven potion on other factions, then a Wolfpack member will become either a normal Werewolf or a Shape Shifter, and a Village member will become either a Villager, Lycan, Sleepwalker, Insomniac, or Stalker. Vampires and familiars are not affected by the potion.
But if an Alchemist targets an Undead player with their purge potion, what role does the Undead player become?