Lots of great ideas here. I am interested in the following. PM me if you are interested in rping any of them with me!
Age Play
Son's Bestfriend/Mother
German Soldier/SS Commander's Daughter
Wounded German Soldier/Jewish Girl
Slave Owner's Son/Slave(Civil War)
Barkeep/Outlaw
Nazi/Jew
Death/Victim
British Soldier/Colonist(Revolution)
Professor/Student
Teacher/Student 
Principal/Student
Brother/Sister