Jacek Varilion is the scion of a rich house, minor nobility but also the owner of a vast mercantile empire. As the third son, he was freed of the need to take over either the family title or the family business, and thus spent his time in either the fencing halls or the dance halls of Egorian. He developed quite a reputation as a brash young rake and haunts the nightmares of plenty of fathers of the boys he duels and the girls he beds. In fact, he has lately fostered a habit of bedding a girl to provoke a brother to challenge his sword, a game that he has mostly escaped unscathed. Unfortunately, he played this game once too often, being caught with the (formerly) virgin daughter of one of his father's business partners the night before her wedding. This caused both the girl's arranged marriage and an important deal of his father's to fall through. His father was furious, giving him two choices: be disowned and disinherited or grow up and represent the family interests on a mission to the north. There was not really a choice for him, as losing his name and his money would ruin the lifestyle he has come to embrace. Instead, he buckled on his rapier and swore in Asmodeus's temple to expand his family's business in the new northern territories.
Jacek is hot-headed and passionate, but lives (and perhaps will die) by his personal honor. A human, he is a bit below six feet tall, with dark hair and a rakish mustache and goatee. While he wants to get his father's trading post established and get back to Egorian, he takes the oath he swore seriously. Of course, if he could find something more exciting to do while still fulfilling his responsibility...
Game-wise, he is a human LN rogue (I'm picturing him more as a duelist/swashbuckler rather than a pickpocket type of rogue). Naturally, he is a settler rather than a militiaman.