From The Heretic Knowledge Vault
This large (6'5", 240#) fellow starts the game as one of the Gewehr contingent in Kiyoka. Unlike practically all of the other Gewehr people except Layla, he manages to avoid being wiped out in the carnage in the dock district, through the simple expedient of being somewhere else when it happens. He makes it back to the safe house at Rising Moon Vineyards just in time for a weird encounter with Rokku Sona, who shows up (as a result of a case of mistaken identity involving Kureji Mesuinu) to help the bereaved Layla close down the decimated operation. Remarkably, both Oskar and Rokku survive this encounter, and Layla gives him the same get-out-of-town order that she herself has received.
He's next seen in a brief appearance at the World Traveler Inn in Port Lorrel, where most of the player characters (Lucas, Jamie, etc.) have gone to ground following their ocean voyage. Even more remarkably, his encounter with these worthies also doesn't end fatally either for him or for any of them, although there is certainly enough bloodshed at the place involving other NPCs. He's last seen heading off to a Gewehr safe house somewhere in town, thus becoming one of the very few NPCs who disappears from the game alive and more or less gracefully.
He's recently washed ashore in Rinkaiel, where he's trying to help the Gewehr establish a very low-profile foothold. Given the quality of the hired help he has to work with (e.g. Fritz and Weed), you have to feel a bit sorry for the guy; he definitely has his work cut out for him.