The murderer. neutral killing. It has the same basic idea as the serial killer but the murderer can only kill once. if he get's r'bed or jailed and kills them then it uses up his only kill.
The kidnapper. mafia. It can capture any person for the night. if the captured person gathers info then the info they gained that night will be instead given to you and the captured will be shown as r'bed.
The arbiter. town support. A role blocking role where if it r'bed the sk (or murderer) they cannot be killed.
The distributor. neutral. Can give out bulletproof vests. Only three vests a game, one per person chosen. The vests can be given all in one night or on separate nights.
hope you like my ideas.