You asked the right OP, because I love overthinking things lmao

Based on how he's dressed, I believe that the violin belongs to the man with the pistol in the background. The dog reminds me of Toto, so I think these folks were all at an event together when a tornado blew through the recital hall and transferred everyone to this new location where flamingos rule the world. The dude in the foreground is simply just a scared stoner that barely understands what happened yet, and was clearly a survivor from the initial slaughter when they all came to this mysterious land.

As for the firearms, I believe that these folks all came from Florida since they knew where the water would be relatively safe from alligators. It could be that through the nature of Florida people, everyone at the recital was packing, or they could have belonged to police officers before they were killed. The nun was given the violin bow as a last resort due to her vow of upholding the scriptures, she was too uncomfortable with wielding a gun.