SM
Bigfooty Legend
Pretty much everything Timothy Zahn wrote: Thrawn, the Unknown Regions, the Nogrhi; the Han Solo books fill in his back story better than the movie did. I’d have to go back and look at some of the books for more but all the world building in the EU was expanded on by other people. Lucas laid out the framework and some of the better writers added to it. Others not so much.
Sorry I thought you meant in the movies.
I'd agree with that. A lot of the books have some fantastic plots.