The Magic Mirror is one of the non-playable characters in LEGO Dimensions 2: The Rise of Enoch, from the Shrek franchise.
The Magic Mirror now appears to be claimed as a TV screen, reporting the news of Shrek, Donkey and Puss in Boots being captured by the guards of Far Far Away and is seen during the song "Livin la Vida Loca".
Shrek Forever After
In the alternative universe he is again being used as a TV screen announcing that Rumpelstiltskin would have an announcement to the people of Far Far Away that if they catch the ogre Shrek they get a grand reward.
Shrek the Musical
The Mirror's role is no different than the first film. It still helps Farquaad pick Fiona as his princess, and is used for his amusement.