I'm rather fond of Haer..though admittedly it took me a while to really make him useful for my party. I definately prefer his responses and voice to a lot of the other NPC's, which is a cheezy reason to pick him, but I'm a cheezy sort of person.
I gave him a ring of regeneration later in the game, and basically use him as backup for my front-liners more than a front liner himself. With improved invisibility, he's a right sneaky fellow, and also, he IS the best pickpocket NPC out there. I had him picking shadow thieves' pockets, and got some nifty items off them.
I just have him scoot around the fringes of a fight, and lend his blades and spells to another party member who's getting hit hard. Also, he's now my magic-breacher. I couldn't find any offensive spells I really liked for him, so he's the one who uses 'breach' 'pierce magic', etc on the bad guys while Aerie and Imoen smite them from a distance. The spells seem to have success more for him than for the girls too, but maybe that's just me.
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Playing the cutest li'l Chaotic characters since 1996.