I made a post about ones you can diy (link), which can be worth checking since these will just be additions, but I wanted to list some more gift ideas for a bookish person in your life, or even for one who isn't!
Trinket:
Bookmarks, key-chains, necklaces, earrings, bracelets...
(Google a favorite of theirs and maybe it has a famous quote or symbol for it, or maybe go about it with the general theme of books)
Wearable:
Scarf, shirt, even an umbrella!
(Again you can pick a favorite series of theirs and Google to see)
Decor:
Clock, computer decal, candles, posters, bed sheets, table cloth
Other:
Mugs, glasses, coasters, makeup brushes (for example HP wand ones)
Another thing, is that if it's a particular fandom that not too popular, or it can't be found, is that ebay is a place to definitely check! Lots of handmade things and there's something for everyone there!
For even more you can check this list: https://ebookfriendly.com/best-literary-gifts/
Read on lovelies,
S