Okay...should be sleeping...but just realized:
The XXXXX Protector: as long as this person is still alive, the ~~~~~~~~ cannot be killed. If the ~~~~~~~~ is attacked at night, then the Protector must not ~~~~~~~~~~ him/her. If the ~~~~~~~~ is lynched, then if that person is killed the Mayor can prevent the Protector's lynching instead.
The Criminal: This is the player that the Drug Addict and the Serial Killer are trying to find. He/she is aware that they are trying to ~~ ~~~~~.
So there is only one 8 letter name, probably the name of the other secret role...
Okay, now BED...for real! (Shut up, my stupid brain ;P)