I shall also correct American spelling.
Probably the Doctor. But there are so many characters it's difficult to choose.
Least Favuorite character:
Again, difficult to say. I'm tempted to say Turlough - starts off with a good character arc, ends on a bit of a high, but the bits in the middle mainly saw him relegated to "boring regular companion" status. I mean, heck Doctor, this guy has been trying to kill you for the past twelve weeks! Could there not have been a bit more...I don't know, tension?
5 Favourite ships (canon or non-canon):
Canon? Doctor/River; Doctor/TARDIS; Amy/Rory. As good as canon but they never actually said it on screen? Doctor/Romana II. And Ian/Barbara, too. Now canon thanks to SJA.
Character I find most attractive:
Off the top of my head, Martha.
Character I would marry:
Well, as a teenager I had a crush on Ace. If we could have got together (difficult as she's fictional, but you never know) I can imagine wedding bells ensuing...
Character I would be best friends with:
I like to think I'd get on well with the Doctor, specifically Ten and Eleven.
A random thought:
Could someone please invent a real TARDIS that's actually bigger on the inside and really travels through time and space? And then let me have one?
An unpopular opinion:
Terminus is a really great story. IMO.
My canon OTP:
Doctor/TARDIS I think nowadays.
Doctor/Romana II. In Paris. To Dudley Simpson's music. Come on - after they left Duggan in the Eiffel Tower, they so had a romantic meal...
Most badass character:
The Brigadier. "I just do the best I can."
Pairing I am not a fan of:
I don't tend to ship much in the Doctor Who 'verse anyway. I guess my least favourite pairing would probably be Doctor/Master. I mean, I can see the appeal, but they're meant to be enemies. So I'd have to rationalise why they're at each others throats one minute and then madly in love the next. Mind you, some people tell me that's what marriage is like. (It's not my experience, though.)
Character I feel the writers screwed up (in one way or another):
See earlier comments about Turlough.
Doctor/Brigadier. With a special bonus shout-out for Three/Jo.
Character I want to adopt or be adopted by:
I'd adopt K9, if I could. I also wouldn't mind being adopted by the Doctor. Eleven for preference. Just whisk me off into time and space, you mad man with a box, you.