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Anomen and Haer'Dalis are cool.
Stop the hating.
Anomen is a blowhard but whom you can teach the error of his ways. I think that's a pretty cool concept for an NPC. Also, he's voiced by Rob Paulsen which is instant win. NARF!
Haer'Dalis is probably the deadliest NPC you can bring in your party, and he says funny things. Also, voiced by Michael Bell, one of the most prolific voice actors ever, though he's mostly in incidental roles rather than recurring ones.