Reference

Several "Doctor Who" characters have indeed been given their own book series, extending their adventures beyond the television screen. Here are some notable ones:

1. Sarah Jane Smith:

   • Sarah Jane is one of the most popular companions and starred in "The Sarah Jane Adventures," which also includes several novelizations of the TV series.

2. River Song:

   • River Song has appeared in various novels and audio adventures that explore her complex relationship with the Doctor and her own past.

3. Torchwood:

   • Characters from the "Torchwood" team, including Captain Jack Harkness, Gwen Cooper, and others, have their own series of novels that expand the lore of the "Doctor Who" universe.

4. Bernice Summerfield:

   • A companion of the Seventh Doctor in the Virgin New Adventures novels, Bernice, or Benny, has her own extensive book and audio series.

5. UNIT:

   • Characters like Brigadier Lethbridge-Stewart and Kate Stewart, associated with UNIT (Unified Intelligence Taskforce), have featured in novels and spin-off series.

6. Romana:

   • Romana, a Time Lady and companion of the Fourth Doctor, appears in several spin-off novels.

Visual References:

Here are some images linked to characters with their own book series:

For further details, you may want to explore sources like the TARDIS Wiki which provides comprehensive information on the spin-offs and book series related to "Doctor Who" characters.