The Plug is an antagonist of Don't Hug Me I'm Scared 6.
He is a future teacher as he appears in the rapid teacher sequence when he was torturing Yellow Guy along with the other teachers.
He is the same plug used to power the control room machine which Red Guy tampers with.
The plug seems to have no lines however it is shown to possibly be extremely energetic seeing as its mouth rapidly opens and closes implying that it may talk a lot. This may also however be due to the fact that there was nothing to control the mouth