Im compiling a list of the most Jacked up people in all of Faerun, Here are my 2, Feel free to contribute...

1)Xan the Enchanter - Have you ever met anyone as morbid? "Were all doomed...", and "Our Quest is Vain!"

2)Bassilus - Im Speechless, dont even know where to begin, "Nothings more important than family,"

Tiax is supposed to be out of his mind, although I have yet to use him myself (just met him and declined his offer to join). Minsc is a obviously a bit "touched." Capt. Bragge is another who, like Bassilus, went mad. In a way, Durlag (well, his ghost anyway) also kind of went nuts.

Heh I think most of the people in that game are totally loopy.

Bassilus is hilarious. The second I heard him, I just cracked up, he's such a laugh :D

"Oh brother Thurm, why not grace our ears with a ripping tale of the old days, always a delight...."

Gotta love him ;)

That guy (what's his name?) outside Candlekeep who wants to jump of the cliffs, he's funny.

The guy who wants to jump is named Chase.

Portalbendarwinden is another wingnut.

If you got Motaron and Xzar in your party,have one of your party members kill motaron.Xzar's reaction,I personaly think its funny,
"Motaron..I...I,never loved you"
Tip.
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If your rep. gets too high they will leave your party,and if you have khalid or jaheira,they will become unclickable,and attack each other.
Just the opposite for Jahiera & Khalid.Its all in their scripts.

Portalbenwinder is very funny, if you say the right text to him. I love that one where you can say to him, OKay, i have just had enough of it. One more wise crack and I'll take a blunt weapon the size of Elminster AND his hat, and shove it down into the very crevice of your throat that not even beasts from the nine hells themselves would not approach it with a 9 inch rusty halberd. Its a very long text, and it makes me laugh. Quayle is very, disturbed. And the little boy demon who wants his dog ruffie. I killed him, but he's insanly tough for guys on level 4 and 5. Ruffie is quite easy though.

For pure insanity, gotta love Xzar, Tiax, and Bassilus. For weirdness, there's the Drunk by the Beregost temple, and Maple Willow Aspen and Borinole Mann in BG. Also, I once role-played a Druid through ToSC, and got into an interesting conversation with a girl named Farthing: She's not old enough to hunt yet, and wanted to know if I was allowed to hunt. I, being a Druid, said that animals should be cherished & respected, not hunted & killed. She thought that was silly--if we didn't eat animals, what would we eat? I then told her of the mystical bush that gives the fruit called Tofufruit, as well as the Sacred Couscous and the Holy Bean Sprouts. "These and other bland, unappealing foods await those who renounce the consumption of flesh." I was busting up! GOTTA love it. :D

Also, is it me, or did the Mages ALL get great voices? I happen to love Xan's pessimistic tone, Quayle's whiny bragging, and Edwin's hideously inflated ego. Whenever I do an Elven Mage/Thief (which is a lot), I always give him Quayle's voice, and I usually hack his CHA down below 8 to complement it. In the party I've got now, I'm using Quayle's voice, Dynaheir for my Cleric/Mage, and Xan for my Ranger. ("We should all save our effort and just lie down and DIE.")

The woman with all the spiders in the cloakwood, the really fat one...she is really really whacked.

Here's another: Mutamin. The gnome mage who wants to add you to his "gallery."

How about Shar-Teel? She's not crazy in a wacky way like those others you guys listed, but she does have a serious mental health problem, probably due to traumatic experiences in her childhood or something like that.