1. Kasumi - I have yet to play her DLC (downloading right now) but I'm really excited about her character. The only thing that disapoints me is that she doesn't have any dialouge trees, but that just makes me want her even more in ME3.
2. Mordin - He was great, probably one of my favorite people to talk to, which is a bit odd considering I found him pretty annoying when I first recrutied him, a little later on he was one of my favorite crewmen.
3 . Tali' - She's just really cute. xD
4. - Miranda - I don't want her for her personality so much as I want her for her skill set.
5. - Leigon - I'd be kinda interested to see some more out of him, I'm still not entirely sure why he used that N7 to patch up that hole. Course I never really did ask too much about it.
6. - Thane - I think it'd make it more emotional if he was with the squad for a little while before he finally died due to his disease.
7. - Grunt - I would say "Wrex" but he's kinda dead so I'll accept the next best thing. =D (Sometime I really should playthrough ME1 and make sure he lives.)
8. - Zaeed - I don't know why I like him so much, but he's pretty awesome.
9. - Kasumi (Seriously, I REALLY want her to have a full role in ME3

)
10. - Honestly I'm fine with the above listed, I won't really freak if I don't see anybody else, I kinda liked Ashly in ME1, but I was disenchanted after the horizen incident.