Gary looks similar similar to Expunged during Cheating, but instead has a black hat with an image of Hypno's Lullaby Girlfriend doing her up pose on it, a green shirt with a picture of Baldi with a heart (along with white text that says "one love") and black pants.
Cynda, formerly one of the main composers of Golden Apple, revealed in a reply to a comment on a video that Gary stole his hat from a goodwill.
Gary was originally made by Rapparep, the artist for the OG Vs. Dave and Bambi, and then gave permission for the Golden Apple team to use Gary.
Gary has a counterpart called Edgar.
Both are scared of each other.
Apparently, Gary and Jeff are friends. (this isnt confirmed yet)
Gary is afraid of the 3D version of Jeff.
When he saw it for the first time he said "Wha the s***?".