Conformist

Conformist is a mafia deception role that appears to be a member of the Town to the Cop and who will appear as a Townie under any circumstances where your role is to be revealed.

Basic Mechanics
Every time the Conformist is checked by a Cop, they will see "not mafia" making the Conformist immune to Cops. If at any point in the game the Conformist's role is to be revealed (like to a Detective, when an Oracle dies, or on death), it will show up as Townie.