Because I remember Elmonster's Journal, I'm expecting some Yattaf fanfic in between the fight recaps.
Jesus I should have written it from the start, because I've already forgotten most of it already. (Nice link by the way)
Basically Yattaf is strong, smart, independant. She doesn't need anyone's help. She wants to be everything at once to handle any situation: She's a fighter and mage and kleptomaniac, basically anything but dumb priest or dumb bard.
She won't admit it but she just didn't care at all about her old man getting killed by Sarevok in the intro (Let's face it, Gorion has always been a relic to her, she doubts anybody has ever cared about him), but she seeks revenge purely because she felt personaly humiliated. To this end, she's willing to do mercenary work for all the wrong people for more money.
Yattaf grew up with Imoen, and always found her kind of... gross? She sometimes hung out with her because she was seen as the hotter girl of the two, but that was basically it. Imoen always tried to stick with her and never really understood Yattaf's numerous messages. As soon as Yattaf found a way to get rid of her without getting her hands dirty, Imoen was gone from this world.
Yattaf's reputation in the Sword Coast has been pretty terrible lately, and if you ask her it's mostly because she's terribly honest. This one guy called Minsc asked her about rescuing his girlfriend and she just couldn't give any fuck about it. Minsc attacked her and met a swift death.
Similarly, a drunkard and a bunch of druids probably expected more politeness than they should have from Yattaf. They're all dead. Yattaf is very touchy about her freedom to go wherever she wants and I sincerely doubt she's ever going to apologize to anyone.
Yattaf always had the option to have a faithful familiar with her, but she's too cheap to feed him.
At one point one guy asked her a riddle :
"It has neither mouth nor teeth yet it eats its food steadily.
It has neither village, nor home, nor hands, nor feet; yet it wanders everywhere
It has neither country, nor means, nor office, nor pen yet its ready to fight - always
By day by night there is wailing about it.
It has no breath yet to all it appears."
Yattaf gave the obvious answer: A bear. Yet the guy still attacked her. Oh well, she killed him and collected the bounty on his head: Happy ending.
In battle, Yattaf uses everything in her arsenal. Against an average enemy, Yattaf hides in shadows to hit her first target's weakpoint with her bow. She then unleashes any status effect (Sleep, Charm, Hold) while still showering the enemy with arrows. If all else fails and the enemy's at close range, Yattaf confuses it with Mirror Image, attacks with her Spider Bane and drowns him with various attack spells like Magic Missle or Agannazar's Scorcher.