Almost conclusive typings. I'd be really surprised if any of these are more than slightly wrong.
Alistar: ESTj (a very practical, active kind of guy that errs on the side of being boring a lot)
Morrigan: ENTj (extroverted, Ni and too harsh to be ENFj)
Wynne: ISFj (a strong, unwavering person that acts as the conscience of the group)
Leliana: ISFp (the bard/rogue person of the group - quite subdued, likes to tell stories)
Zevran: ESFj (charismatic, ideosyncratic, extroverted, alpha as hell)
Sten: INTp (extremely cryptic, abnormally quiet, zero command or appreciation of Fe)