The Dr Who 13 announcement prompted me to record a few more additions to this list:
- Nell Ingram in the Soulwood spin-off from the Jane Yellowrock series
- Joanne Walker in C.E. Murphy's Walker Papers (discovered via a not-canon-in-either-series crossover with the Jane Yellowrock books)
- Antimony Price (from later in the Incryptid series already mentioned above)
- Henrietta "Henry" Marchen (aka "Snow White") from Seanan McQuire's "Indexing" books
- Venera Fanning and Leal Maspeth from Karl Schroeder's "The Suns of Virga" series
- Clary Fray, Tessa Gray and Emma Carstairs from Cassandra Clare's Mortal Instruments series and its prequels/sequels