I favour a view that everything is canon, everything is in continuity (or
a continuity), at least so far as I know or remember it. That's not something I want to foist on anyone else though. Except for my own game...
I can point you somewhere. :)
Prof. Bernice Surprise Summerfield, or Benny, is an archaeologist (technically unqualified) of the 26th/27th century. She's clever, witty, messy and disorganised, a heavy drinker, and keeps a diary covered in post-it notes to revise but never erase events. She might be an actual pacifist, but I need to reread. She was a heroic space adventurer in her own right before meeting the Doctor, independently of travelling with him, and after leaving him, and had many more adventures without him than with.
http://tardis.wikia.com/wiki/Bernice_Summerfield
Benny first appeared in the New Adventures novels, in
Love and War by Paul Cornell, which is a good intro to her. It took a couple of books for other authors to get a good handle on her (probably having begun writing before they saw
Love and War), so she spent good few books being possessed, absent, or on space drugs. From
Lucifer Rising on, she should be fairly consistent. As I recall, Benny-centric stories are
Birthright,
Theatre of War,
Sanctuary,
Human Nature (the original),
Shakedown, and
Just War. Then there's
Happy Endings, with Benny's wedding to Jason Kane, which is a gloriously silly romp and celebration of the NAs. Benny leaves there, but pops up occasionally thereafter, in
Return of the Living Dad,
Eternity Weeps (with her divorce, because that wedding went so well, and Mortimore doesn't like happiness), and
The Dying Days (with the eighth Doctor).
http://tardis.wikia.com/wiki/Virgin_New_Adventures (the list shows which ones she appears in)
Then the BBC took back the Doctor Who licence, so the New Adventures just went on without him and used veiled references to to Whoniverses, making a Benny-focused series where she worked out of St. Oscar's University on the planet Dellah, leading to the first inkling of a time war with Gallifrey.
http://tardis.wikia.com/wiki/V...field_New_Adventures
Of course, all these novels are out of print. :( However, you can get
Human Nature as part of the recent History Collection and
Shakedown in the Monster Collection. Otherwise, I'd recommend touring your library second-hand bookshop and seeing what turns up (which is how I discovered
Doctor Who and acquired most of my collection).
She went onto appear in Big Finish audios and novels, starting with some NAs revised to remove the Doctor, then starting a series where she works for the Braxiatel Collection for Irving Braxiatel (almost certainly the Doctor's brother). Big Finish had the Who license, so they restored Who monsters and things. I don't know where the range went after that, I wasn't able to follow these. (Though I almost wrote a short story for it once.) So, I can't help much with these.
http://tardis.wikia.com/wiki/B...e_Summerfield_series
You can watch Benny in action in the "Dead and Buried" animated short film:
https://www.youtube.com/watch?v=qwbWpBxosvo
Which is the easiest place to start.
Also:
Extract From 'Practical Archaeology For Beginners' by Prof. B. S. Summerfield PhD, FGAS. (First Draft). Editor: Paul Cornell
http://sorddin.com/broadsword-old/issue4/twd4.html
Running almost continuously for 23 years, across multiple ranges and media (novels, comics, and audios), Benny is a major SF character in her own right and it's quite an impressive achievement. The stories are
Doctor Who–styled adventures, dips into various SF genres and styles and pastiches of other stories, and some amazingly silly fun romps.
http://tardis.wikia.com/wiki/B..._list_of_appearances