Atton Rand - Han Solo Clone
Atris - proper, but not Bastilarrogant (new name for Bastila's personality). suspicious of you because of your dubious past, but warms up to you, eventually falling for you and choosing whichever path you take.
Mira - saucy bad-girl with a good-girl heart
Kreia - probably annoying mentor-style banter for the whole game
Silver Armor Guy - Canderous?
T3-M4 - anything at all?
I still think it would be a good idea for a Baldur's Gate 2 romance style, with three options, good, bad and neutral (ie. Aerie, Viconia, Jaheira). That would be Atris, Mira, and Sith Chick.