Guys, I wonder. This Runcorn is actually one of the original forty right? but his/her name is gone from the original forty in the pottermore, but acording to this picture

Screenshot of J. K. Rowling's notebook from Harry Potter and Me

Runcorn is one of them (his name is above sidebottom and below roper.)

Here is pottermore's original forty transript or you can see it on your potter more account. So is this JK Rowling mistake or another secret of harry potter? PS: english is my second languange. sorry, if my grammar is bad :) —The preceding unsigned comment was added by User:Zaki alwi (talkcontribs).

Which is odd because, if you count the names (not counting the "crossed out" entries), the 'Original Forty' are only thirty-nine. I'm almost sure Rowling accidentally skipped Runcorn when she was transcribing her notes. --  Seth Cooper  owl post! 00:15, May 28, 2012 (UTC)
Runcorn is a girl; there are twenty boys and nineteen girls on the pottermore list! 03:00, January 16, 2013 (UTC)

can it be assumed she would be the final slytherin girl? If Albert Runcorn is her dad, she would be pureblood or at least a halfblood and juding how her dad acts in the 7th book would be affiliated with Voldemort and his ideas.

Notebook houses

Sophie Roper and Sally Smith are in Gryffindor and Runcorn is in Hufflepuff.

She is actually one of the two missing Hufflepuff girl; I noted it zooming the picture (300 %). The other one being (most likely) Lily Moon.GianG (talk) 17:37, December 26, 2014 (UTC)

It says on the Runcorn page that all five Slytherin girls are known. Check again, only four are known, as far as I know: Pansy, Tracey, Millicent, and Daphne. It's still possible that Runcorn may be a Slytherin, even if Rowling originally made her a Hufflepuff. After all, she originally intended Anthony Goldstein to be a Hufflepuff but then put him into Ravenclaw instead! Assuming that this girl is the daughter of Albert Runcorn, she is highly likely to be a Slytherin - unless she disagrees with her family's social views, that is.