I agree that Christopher Robin is not Christopher Milne.
My only question is: do we really need a fictitious character heading for Christopher Robin? We don’t make one for every fictitious character. The dubious assertion that certain books were fiction about the real-life Christopher Milne seems to have been thought by at least one cataloger to have been of interest for cataloging purposes, but I’m not sure there’s a call for a heading for Christopher Robin the fictitious character, unless he has been a character in some non-Pooh-related books, or a subject of nonfiction books. Which may well be.
While cataloging a Winnie-the-Pooh Hebrew translation, I ran into an oddity. I wanted to run it by some wisdom lest I run afoul of an established practice.
I note that there are a few records in OCLC for Winnie-the-Pooh related resources which have a subject heading of
600 1 0 Milne, Christopher 1920-1996. Juvenile fiction
(Indeed, the OCLC record I was working from had the same heading)
It seems to this cataloger that Christopher Robin, though based on the actual son of A.A. Milne, is a distinct person in his own right and his appearances in fiction are not simply fictionalized appearances of Christopher Milne.
Alice (Fictitious character from Carroll) and
Hargreaves, Alice Pleasance Liddell, 1852-1934
Here the distinction has been drawn between a fictional character which shares a name with, and is based on, an actual person.
So what say you O Best Beloved, am I justified in creating:
Robin, Christopher (Fictitious character)? (actual AAP may vary)