Papyrus will be helping search for Metaplot, because if they're doing RM's plan they should do it right and prepare all they can, and where else to start searching for info than in a big library? Perfect! He hardly could have planned it better himself! He may try trading the book he got back in the Manor, or write some stories of his own, in hopes of getting something useful.

Unfortunately, he's going to spend a lot of that searching time complaining about the lack of organization in this place. How does anybody find anything!?

He can probably get by in the story combat stuff, he's at least imaginative and assertive enough about whimsical things for it, but hopefully internal coherency isn't necessary in those narratives.

In terms of story fragments, the UT cast is in agreement - there's Scribe versions of various timelines available for finding. A version of the first human's fall, along the lines of the game's opening video, is pretty on point. I plan to write a couple of mixed mood things, with the importance of kindness and the risks of carelessness, about a few things in the game.