Yes, I always wondered if P.B. has asked JRRT about the characters a bit, but all I'm aware of today is that Tolkien added details concerning the map itself, which is why her poster-map includes some things not published in any editions of The Lord of the Rings (not published in any earlier editions I mean).
John Rateliff quoted some of JRRT's commentary however (and Douglas Anderson appears to have paraphrased a section). Quoted examples include: Mr. Baggins page 49 (concerns Gandalf), page 186-187 (concerns Gollum) -- I'm not sure if there's more here as I haven't read both volumes of The History of the Hobbit yet, from cover to cover at least.
Hammond and Scull quote selections from these notes in their The Lord of the Rings: A Reader's Companion (2005), on pp. 3-4, 107, 229, 244-5, 265, 272, 447, and 493. Christopher Tolkien had earlier published a part in Unfinished Tales (1980), pp. 286-7, and I found out that the note concerning Celeborn on p. 286 is from some other source.
The whole of the notes would be interesting anyway!
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