I know that is all about DW on tv, but can I show some love/support for two of my favourite Audio specific companions...?
Beth Chalmers as Raine Creevey
Companion to the 7th Doctor. Glamourous cat burgular.
and
Tracy Childs as Dr Elizabeth Klein
Companion/Aquintence of the 7th Doctor. Former Nazi scientist turned head UNIT scientist. Klein doesn't like the Doctor in the way that the typical companion does, and that is what makes 7 & Klein such a unique team. What began as a strong mistrust of one another, has slowly evolved. There is still a mistrust (afterall, she met 7 when he was still in his manipulative phase) between them, but it has mostly developed into sort of grudging respect. Klein even has her own nickname for 7, The Umbrella Man. And she is due to return later this year.