Question on certain character at end of series

I finished the series for the first time like 6 months ago and in that time I read the Stormlight Archive by Brandon Sanderson, who so wonderfully finished the Wheel of Time. In my "I finished the series" post here, someone in the comments mentioned something about end of series Perrin being essentially a combination of 2 characters from Stormlight Archive? Does anyone know anything about this? Having now read Stormlight Archive, I have no idea what two characters this could be. Google hasn't been helpful here either. More broadly, very very curious about Sanderson's influences on the Wheel of Time characters and if anyone has thoughts on that. I know people are generally displeased with what he did with Mat.

Pls put a spoiler tag around any Stormlight spoilers if they happen to come up for people who haven't read it. ^{(also no Stormlight 5 spoilers please lol})