There is just one NPC I never use( other than the first playthrough) - and that is the inscrutable Yoshimo. Yoshi's just a great character though. Generally I run my own PC thief based character.
(As if you didn't know.

)
Haerdalis is insufferable. Man, I kid you not, he's INTOLERABLE. After hearing his "Ode to Aerie" I personally backstabbed his sorry behind into chunky dogfood. Happenned to get me a Critical hit to boot!
"A solid hit!"
Ahh.

memories.