I offer a role
The Shifter can take over the role of another Crewmate, the other player will transform into a Crewmate.
The Shift will always be performed at the end of the next meeting right before a player is exiled. The target needs to be chosen during the round.
Even if the Shifter or the target dies before the meeting, the Shift will still be performed.
Swapping roles with an Impostor fails and the Shifter commits suicide after the next meeting (there won't be any body).