User blog:DamiedeterJR/All of the Secrets and Theories of Gravity Falls

Bigfoot
I'm not sure what he is, but he strangely looks like he's wearing a fez like Stan, so it could be Stan in a costume, but who knows.

Ending picture
Here's what I think the symbols mean:

Glasses - Stan

Question Mark - Soos' shirt

Bag of Ice - Either The Inconveniencing or The Time Traveler's Pig

Symbol - Stan's fez

Pine Tree - Dipper's hat

Star with eye in it - Tent of Telepathy

Hand - 2 or 3

Llama - One of Mabel's sweaters

Shooting Star - Another one of Mabel's sweaters

Heart - Robbie

Cryptogram
"STAN IS NOT WHAT HE SEEMS" This could mean that Stan isn't human, but who knows who he really is.

TO BE CONTINUED