Although I was sad to see First go, it was worse with Second and I actually postponed watching the last four stories for about two weeks, because I didn't want Second's run to end. Luckily I still have three more appearances of Second to look forward to: The Three Doctors, The Five Doctors and The Two Doctors.
Ben & Polly. In the end I never did like Ben. But that may just be because he never got a moment to really shine. I did, however, enjoy Polly's presence. Especially during The Underwater Menace and The Moonbase. Both of them got a chance to shine during The Faceless Ones. I was a little sad to see them both leave on the same day they joined :P
Cybermen, Great Intelligence/Yetis, Quarks
The Underwater Menace, The Moonbase, The Faceless Ones, The Tomb of the Cybermen, The Abominable Snowmen, The Mind Robber, The Krotons, The War Games
Least favourite stories:
The Ice Warriors, The Enemy of the World, The Wheel in Space, The Dominators, The Space Pirates
Introducing: The Sonic Screwdriver! :D
Remember when the Doctor wrote a fanfiction about himself? :)