“Doppelgänger, wake up and look at another player’s card. You are now that role. If your new role has a night action, do it now.”
The Doppelganger’s strategy resolves to whichever role they adopted upon first waking. The main question is whether to reveal that you were the Doppelganger that became that role or to pretend you were that role directly. You almost certainly don’t want to reveal that you were the Doppelganger without saying what role you copied since the conservative assumption of other players was that you Doppelganged a Werewolf card. If you don’t contradict that accusation immediately, it will be very hard to shake later.
What do you think? Leave your thoughts in the comments section.