[How about an ex-angel, then? He'll hop easily to his side, Appa hovering nearby and entertaining himself by munching on some stray vines (he knows not to touch the poisonous ones).]
Mister Sherlock! Special delivery from Heaven! [He happily hands out a package of books.] I told my friends there that you were interested in reading, so they packed up a few things you might like! [Simple works of fiction, all depicting happy stories and warm feelings. But Sherlock could perhaps find the narrations of Heaven's locations interesting, as well as the insight on the angels themselves that can be found through the stories' characters and the author's own ideas.]