From Blood on the Clocktower Wiki
The Revolutionary helps disadvantaged players participate.
"2 neighboring players are known to be the same alignment. Once per game, 1 of them registers falsely."
If a player is unable to understand the rules of the game, is deaf, unable to communicate, or otherwise impaired in some way, they may still participate by teaming up with a player that they trust. These two players are the same alignment, and sit next to each other, so can whisper to each other throughout the game. The experienced player can help the disadvantaged player in whatever way is needed, talking on their behalf, or suggesting what to do.
The Revolutionary is also useful for couples or good friends who wish to play, but are uncomfortable with lying or mistrusting each other, even in a game setting.
One of the Revolutionary players registers as a different character and/or alignment, once per game.
"United we feigned.Divided, we stalled."