One of the things I've always found interesting about Doctor Who is the relationships between the Doctors and their companions and the way the develop over time. It's interesting how some become more of an equal friendship, some become romantic, and some are more of a mentor mentee realtionship. So I thought might be interesting to see which ones would fall into which category. I'm going by the ones I've seen a lot or are at least fresh in my mind.
Friendship
10/14 & Donna
15 & Ruby
15 & Belinda
11 & Amy & Rory
13 & her companions
Romantic
4 & Romana II
10 & Rose
11 & River
Mentor & Mentee
3 & Jo
4 & Leela
2 & Jamie & Victoria
4 & Sarah Jane
Ones I'm unclear on
10 & Martha
10 & Jack
Friendship
10/14 & Donna
15 & Ruby
15 & Belinda
11 & Amy & Rory
13 & her companions
Romantic
4 & Romana II
10 & Rose
11 & River
Mentor & Mentee
3 & Jo
4 & Leela
2 & Jamie & Victoria
4 & Sarah Jane
Ones I'm unclear on
10 & Martha
10 & Jack