Disclaimer: This is not a full idea, just some partial ideas
Idea 1: Instructor (Blue Dragon Special/Support)
Night Ability 1 - Retrain - Choose 1 person and a blue dragon class, then visit this person, occupying them, and, if they are Blue Dragon, making them that class - 2/3 uses (Requires Sheriff to not make Knights)
Idea 2: Instructor (Black Rose Special)
Night Ability 1 - Retrain - Choose 1 Black Rose member and a Black Rose class, then visit this person, occupying them, and making them that class - infinite uses, 1 night cooldown (Requires Tactical kills and would replace Mastermind in some modes)
Idea 3: Not a new class
New Night Ability for Cult Leader - Retrain - Choose 1 Cult member and a Cult class, then visit this person, occupying them, and making them that class - infinite uses, 1 night cooldown (Does not require anything additional)
Comments:
Based on a role from another mafia site