6: Lance and Allen, but Lance tends to turn out better
7: Kent and Sain. I've never tried using Lowen (And Marcus and Isadora suck)
8: Eh, I've used Kyle, Forde, Franz and Amelia. Kyle was rubbish, Franz was the best, I found. Stats-wise. This is making Kyle and Forde Great Knights, and Franz and Amelia paladins.
That said, Gilliam makes a killer Great Knight.
9: Oscar and Kieran. I've used Titania on hard mode but she isn't exactly wonderful. Neither is Kieran really
Haven't played 10, and I'm not very far into 1/3/11/whatever...