I might as well give this a shot. Having not played the VN, I'll add in Zero answers due to my flawed knowledge of UBW and HF.
1. Your favourite character and why.
Archer. The man projects an unmistakable aura of snarky badass cool, then proceeds to actually back it up with history, backstory, and in-combat abilities rather than being a poser.
2. Your least favourite character and why.
Shinji. Because unlike Zouken or Gil or Kirei, who are fun villains that help make the story good despite their evil, Shinji is a pustulent bit of scum that should be scraped off people's shoes, and I hate that the cast doesn't seem to comprehend that. Seriously, Rin, have Saber just take out AM without risking your life to save Shinji, 'k? Particularly since he was about to rape you had Lancer not intervened? He's a hair ahead of Tokiomi, since there's a slight possibility that he somehow didn't know what the Matou magic was, even though I'm convinced he wouldn't have cared if he did know.
3. Favourite quote or line(s).
"I am the bone of my sword..." So sue; I'm obvious.
4. Scene or moment that made you think.
Kotomine telling Shirou that a wish to save people was a wish for people to be in danger. Of course, the conclusion of my thinking was that Kotomine was full of it.
5. Scene or moment that made you laugh.
Rin punching Shinji in the nose. Also Gil telling Tokiomi that he wouldn't dirty Ea by zapping Cthulhu with it.
6. Scene or moment that made you cry.
None, really. The end of UBW when Archer faded out with Shirou's face came closest.
7. Your favourite pairing(s).
Canon: Shirou/Sakura; Kerry/Iri; Caster/Kuzuki
Ship-Teased: Rin/Archer
Pulled From Nether Orifice: Archer/Rider
8. Your least favourite pairing(s).
Kerry/Maiya. Bad writing there, and if they'd left it in the F/Z anime I think it would have gravely cheapened the impact of the final scene with Kiritsugu and AM!Iri
9. A character you can relate to the most.
Waver
10. Favourite Command Symbol’s design.
Shirou's
11. A character you disliked at first but grew to like later.
Caster. Sadly romantic backstory melts heart of cynical lawyer and causes overlooking of evil in-story bitchiness.
12. A character you liked at first but grew to dislike later.
Saber. Like someone else said first, it's not so much that I grew to dislike her, but more that I felt rather meh. And seeing her in F/Z embracing the side of chivalric stupidity at a win-in-all-costs war and repeating her foolish desire to not be King of Britain despite the fact that she did such a good job of it (under the reasonably crapsack conditions) to become a hero that echoes down through the ages just made it worse.
13. Favourite Master.
Rin.
14. Favourite Servant.
Archer. See #1 above. Close second-place tie for Lancelot and Rider.
15. Favourite team.
Waver/Iskandar. In F/SN, Rin/Archer.
16. Scene or moment that broke your heart.
Caster and Kuzuki's death in the manga.
17. Scene or moment that made you feel happy.
The credits rolling on the last episode of F/Z with Waver still alive. Any time bad things happen to Shinji (you go, Illya! ) or Lancelot gets Gil's panties in a twist.
18. Scene or moment that made you feel sad.
Archer's death fighting Berserker.Tokiomi's death, because it wasn't painful enough.
19. If you were chosen as a Master, what Class would you like as a Servant and what Heroic Spirit would you like to see to appear.
I would prefer to be in a different city entirely if a Holy Grail War broke out, but if I was chosen I would prefer an Archer since my chosen strategy would be similar to Kiritsugu's and Independent Action and combat pragmatism would be a useful aid in that (particularly if I didn't have all of Kerry's assistants). Assassin would be my second choice, for similar reasons. If picking from any Heroic Spirit shown in the show...probably Medea (despite the Class issues) as the attitude and lack of any individual side agendas (such as EMIYA's) would be most compatible. That answer might change depending on whether the Grail is the functional kind or the corrupted one, though.
20. Favourite Noble Phantasm.
UBW, if we're counting that. If not, Knight of Honor. In F/SN only, Avalon, for showing that even in a world where Excalibur can level castles and Eldritch Abominations, someone read the original stories and noted that the sheath was still the more significant item.
21. A character you would shag.
If I were not married, Rider oh so very much. Also Dark Sakura if she let the world live two more years.
22. A character you would hug.
Sakura.
23. A voice actor/actress that made an impression on you. In which scene?
Junichi Suwabe whenever Archer breaks out UBW. Laughable Engrish is not supposed to sound that awesome.
24. Your favourite scene or moment and why.
What does it say about me that I can't really pin this down? Maybe the aircraft duel between Lance and Gil in F/Z for its sheer levels of awesome? The kind of thing that Moczo would have written.
25. Most tragic death.
Caster's.
26. Most disturbing scene.
Kariya finding out after making his deal with Zouken that Sakura's already started her "training."
27. Unpopular opinion.
The anime, while obviously inferior to the experience to playing the VN, is not the worst pile of suck to come along since Shinji.
28. If you could change the fate of any character, would you? How?
I'd let Caster and Kuzuki have a happy ending where they could just enjoy a normal life as a married couple together without any assassinations, soul-sucking, or any of that. And I would have Tokiomi's death be much, much slower and more excruciatingly painful to the extent that by the time he's done the physical and more importantly psychological damage inflicted upon him would make Kariya's suffering look like paradise by comparison. At the very least, he should get to sympathetically "enjoy" every rape that his daughter suffered, preferably with his own family replacing Zouken and Shinji in his own mind.
29. If you could change a place with any character for a day, who would it be and why (and what would you do).
Truthfully, I wouldn't change places with any of these people unless you paid me quite a lot of money. Maybe Kirei, so I could arrange for Tokiomi's fate as above?
30. Unforgettable scene or moment.
Far too many to count.