Poisoner seems more fun than Arsonist though. It has less of an impact on the actual game because of the delay (and how short games seem to be), but seems to have more of an effect on the metagame.
Oooh I came up with one that isn't on those lists:
Body Snatcher: During the night, the Body Snatcher chooses another living person. All things that would happen to that person happen to the Body Snatcher instead and vice versa. Aligned with Townsfolk.
Example: Erin is a body snatcher. Kevin is mafia. Ronald is a townsfolk. During the night, Erin switches with Ronald. Kevin attempts to kill Erin. The next morning, Ronald is found dead.
Example 2: Erin is a body snatcher. Kevin is mafia. B. King is a cop. During the night, Erin switches places with Kevin. B. King investigates her and sees that she's mafia. The next day she gets lynched.
