Kwaju is one of Koss's old friends before the latter traveled to Istan to train as a Sunspear. He can be found near a Resurrection Shrine in Dejarin Estate halfway between Pogahn Passage and Camp Hojanu during the Estate Planning quest.
Quests involved in
- "Koss and I grew up together. That guy bailed me out of more than one... how shall I put it... compromising situation. Despite everything that's happened to him, I still consider him a good friend."