In Glitchy's Adventure, Shy Guy is mesmerized and being controlled by a unknown character, and fights with SMG4. He is found in Blue Facility's island, (It's easy to notice that he is being controlled, because of his name and sometimes his eyes become weird).
As seen in the video, his HP could be possibly 3050.
He attacks with a spear and is capable of flight. He may also shoot toxic Toast.
If Psychopath is used on Shy Guy, he won't do much besides saying his catchphrase, "Yeah, Yeeeaaah, Toast, Tooooooast ! Get ready to be Toasted ! Wooh !".