+1
Gotrek and Felix is probably where about 2/3rds of my Warhammer knowledge comes from.
FWIW apparently Gotrek is making a comeback in Warhammer Age of Sigmar. Alas minus Felix.
[Edit] It actually looks like there is a Gotrek and Felix Tomb Kings book! I’ve only read the original 12 Slayer books (William King and Nathan Long’s ones). But there’s a “The Serpent Queen” book that looks like it’s set in the Tomb Kings area:
https://www.blacklibrary.com/series/gotrek-felix/gotrek-felix-the-serpent-queen-ebook.html