Characters that are considered non-canon, either because their very existence is contradicted by a higher canon source or they are derived from cut material that does not fit into the version that was published.
“Isobel MacDougal was a pure-blood witch who began attending Hogwarts School of Witchcraft and...Isobel MacDougal
“Miss Granger was a Muggle, second daughter of Mr. and Mrs. Granger and the younger sibling of...Hermione Granger's sister
“This Muggle girl from Liverpool was someone that the late Hogwarts Headmaster Albus Dumbledore...Unidentified Muggle girl from Liverpool
“The mother of Mafalda was a planned character for Harry Potter and the Goblet of Fire. She was a...Mafalda's mother
“This unnamed Muggle was originally the one that betrayed James and Lily Potter to Lord...Traitorous Muggle