Excuse the journal, but what kinda thing are you looking for for Caleb? He's my favorite for Campaign 2, his back story is haunting. I'd probably be able to pull off a decent Yasha (her story is fascinating me a bit too) and maaaaaybe Knott if they're any use to you?
Or I'd happily create someone original - or even the girl he mentioned from back when he was a kid - if you wanted to get deep and dark, depends what kind of direction you'd like.