Jorgen: Yes... I remember!... I was the leader of a group of rogues... Hah, that makes it sound so romantic, when we were just a group of thugs. Backstabbing thugs... The group betrayed me... life was hell from then on out. I was so focused on getting revenge, I'd pay any cost... including my memories.
You can talk to Jorgen in Cafe Moondust after being hired to obtain his Parameter Bonus. He will be standing on the second floor to the right of the stairs.
Once you complete the quest Amnesia. His initial stats and class depend on the items given, see the quest for more details. The Raider will require having the Shield, Sword, and the Boots of Remembrance. As you require the Shield, its earliest availability is after entering Undelwalt.