Igorzk is a CE dwarfen rogue. He lost his clan name because of stealing and killing fellow dwarfs. It seems like he had to flee from his clan and he now tries to make a living by adventuring - just as long as he does not need to do "real work".
He's not a very nice person. Besides from stealing, insulting and playing bad tricks on random persons he is also known for killing innocent or helpless people. It's the influence of the cleric and the ranger (and maybe their big weapons) that keep him from becoming totally psychopathic.