This. Maps rule. A list of characters and their clan histories or ntergalactic backgrounds? Bring it. I also looove mysteries that give you the floor plan of the country house first thing. Let me know how far the Butler’s pantry is from the drawing room, and then baybee we are cooking with gas!

ALL of these. family trees! maps! glossaries!

I also really appreciate a nice list of British terms/idioms translated into American English in the back

I suddenly feel better that my little "promo blurb" of the novel I'm working on has the map of where they're going as an underlay beneath the text. :) (And the further the trail goes, the darker the map gets.)

I don't mind a dramatis personae, especially if I had to wait at all for a later book in a series, but maps are kind of essential in a fantasy novel. Plus, D&D nerd for like 45 years now and making the maps - world, region, city, dungeon - one of my favorite parts.

I want all the maps from all my favorite books on my walls

Oh god the index at the back of a War & Peace listing who was who by their five names each.

Half the fun of Clue as a kid was the map on the board!

And @seananmcguire.bsky.social even gives us readers a pronunciation guide to the names and terminology!