So today I happened to stumble upon a map of Elendel while reading, and I noticed the annotations written on it. They were signed by the name of Nazh. The name was familiar, but I couldn't remember where he/she was from, so I searched it up on the Coppermind. There isn't a page for him or her.
It bothered me, becuase I knew I had seen the name somewhere. So I rifled through a few books illustrations to see if there were any more pictures/maps with his/her writing on them. What I found was in WoR, there are a few maps and drawings with his/her writing and signatures on them. (Pages 83, 138, 218, 732, 958, 1081).
This person seems to have been taken an interest in Kaladin, Shallan, The Shattered Plains, and Stormseat. He/she also somehow got a hold of Navani's journal.
However, considering that this person's handwriting was not only on a map of Elendel but also of things of Roshar, did I find a Worldhopper?