What makes them "plain"?

You mean just the nori without rice and seaweed?

Or a regular sushi nori but without soy or wasabi.

I eat ALL of my sushi without soy or wasabi.

no, the strips out of the package, no rice or fish or wasabi - just completely and utterly plain. not even reconstituted

Um... nope, not done that. But I don't like rice paper either. lol

rice paper! just kidding