Star Trek: Voyager's Robert Picardo will play Mr. Stoughton, no details are known yet about the character.
Marilyn Manson interviewed for Den of Geek, the link in the tweet is broken, HERE is the actual link. There is a lot of weird and wonderful info there about Manson, a few excerpts from the interview about his character:
* Brannon Braga claimed nothing truly bizarre happened on the Salem set until Manson came along. Braga described his character, Thomas Dinley, as a cross between Vidal Sassoon, Jack the Ripper, and Sweeney Todd, and that he'll provide some comic relief that the show has been lacking.
* Dinley is a barber who doubles as a surgeon, an apothecary and drug dealer, an alchemist motivated by gold. Manson describes the character as a “childish sort of sociopath who, when looking at a body, live or dead, was curious about what was inside."
SOURCES: #1, #2, #3
Friendly reminder that Salem has moved to Wednesdays and season 3 starts next week, November 2nd.