Poltergeist is a neutral evil who possesses a person each day, thus speaking through them!
Basically he's kinda like a blackmailer, only he can speak and vote in place of the victim. However, since his votes and speaking triggers will be sent to the victim, he can be detected by observing who can't talk or vote. Furthermore, to prevent harassment, you wouldn't be able to possess someone 2 days in a row.
The idea is of course to be hilarious, but a side effect would be to try and get town to lynch themselves. Kinda like a jester/framer/exe.
Yep.