This is "Beacon God"(yeah, pretty creative name am I right?),a giant , realistic looking pig that appears in the background of the Beacon Room (that is found in Pig City)

He slowly move towards Peppino from the Darkness, And after 1 minute and 30 seconds, he'll give Peppino a thumbs up and vanish. He reappears upon reentering the room.

In the bacon room there are 4 Bacon Gods in order to produce the shake effect. This can only be seen when modding into the game with data .win(I just learnt this was a thing thanks to the Pizza Tower Wiki)

Most information are from the Pizza Tower Wiki

here's the link to the wiki : https://pizzatower.fandom.com/wiki/List_of_miscellaneous_characters