Well, I voted Reyson + Leanne. Although... I somehow always manage to kill Reyson (I like his character though, and he has the best defenses of all the herons), which means I always end up taking Leanne to the final chapter. Rafiel I'm not too fond of... while he can chant 4 people, he doesn't have canto, he has terrible movement, AND he can't fly... I also don't like his appearance :P
This is a bit off topic, but I was wondering if this happened to anyone else: On the first chapter you use Rafiel, I accidently got him killed. He retreated (with the seraph robe D:), but then appeared on my deployment list the next chapter he was usable... What happened there?