1) Do you think he's an only child?
Yes, I think if he had siblings he would talk about them
2) Dog or cat person?
Dog
3) Do you think he was as reserved and careful before BAaT?
Yes, some people are, he is more self controlled since BAaT, though
4) Do you think he kept in contact or has met anyone from BAaT after its closure?
No
5) What do you think his commendations were before being assigned to the Normandy?
No idea, but he would have received accolade wherever he was
6) In spite of his reservations with Shepard, do you think he's a reasonably outgoing guy with others?
I think he is friendly but reserved with everyone
7) What do you think happened between him and Joker after the Normandy SR-1's destruction?
I think Joker probably was furious with Kaidan a few times for not behaving badly or cursing and blaming him (because Joker blamed himself, imo)
8) Do you think his current assignments are coming from Admiral/Councilor Anderson?
Or Hackett...
9) Football (Soccer) fan?
No
10) Do you think the vuvuzela would set off his migraines?
Yes
11) Do you think his next reunion with Shepard will start with tension or relief?
Both
12) What role do you think he'll play in ME3?
Better be a big one................<_<

13) Do you think he's a career Alliance military man, sticking with it until retirement?
Unless something really major changes things (utter betrayal of Shep's achievements for example)
14) Do you think he'd have whatever the future version of a sweet car is?
No, lol
15) Do you think he has his favorite childhood stuffed animal hidden away somewhere still?
No, maybe a few books though
16) Do you think any biotic powers transfer to the children in some way? (Okay, not really Kaidan-specific, but I always imagined he'd be headed for fatherhood... oh wait, maybe I should have asked...)
Not necessarily
17) Kaidan: destined for fatherhood?
Definitely, he would be an amazing dad

18) Do you think that, time permitting, he still calls his mother every Sunday? (I bet he would have written to his mother after being revived from the dead.)
He would contact her whenever he was able, I guess
19) Do you think that panel he kept working on in ME1 was the tv?
No
20) Do you think Kaidan would find an evening at the opera a good time?
I think he would shift in seat, not as much as Shepard would though....