This sort of question He's right behind me, isn't he? is popular on comedy TV shows.
It's usually said by somebody just after they've been poking fun or talking badly about someone to group of other people. The group of people are all laughing at the butt of the joke/abuse and then fall silent. At this point the ringleader notices that the group has gone quiet and asks He's [the person being made fun of] is right behind me, isn't he?
It's not exactly a rhetorical question because the ringleader doesn't know for sure but they are very confident that the answer is yes.
I am asking if there is an English grammatical or linguistic categorization for this type of question. I'm not asking about the use of this type of question on TV or film or stage.
I now know what a tag question is, and this is a tag question but I would like to know if it also another type of question
It is very close to a rhetorical question but it isn't because it does matter what the person being asked replies.
I don't think it's a leading question because it's not really encouraging anyone to give either a yes or no answer that suits the person asking the question.
My question is: what category of question is this?