Nonfiction, because they're still describing what we observe, even if what we observe is made up. For example, literary criticism is nonfiction, even though the subject itself is (usually) fiction.
@trinsec Okay, I went back and looked: I didn't realize the Reply feature quoted automatically. Still learning my way around.
@medigoth Yeah, this is the normal reply where you start a conversation thread.
The @-thing is not quoting but a mention. Just so you know!
@trinsec, thanks!