The letter in the epigraphs in Way of Kings, the recipient–is he or she–are they in Words of Radiance?
They are not in Words of Radiance in person.
Will they be in the next book?
That’s a RAFO. But they have not appeared in person in the series yet.
If you are viewing this on github.io, you can see that this site is open source. Please do not try to improve this page. It is auto-generated by a python script. If you have suggestions for improvements, please start a discussion on the github repo or the Discord.