I love Mio she's probably the first person who say no to someone had just summoned them out of nowhere. Her mean attitude toward the prince or the kingdom was pretty valid reaction. I like her thinking was fast enough to know the situation, quiet the logic type of saint she was unlike the other saints I read in the past. Plus her being the a fujoshi... Thats new.
Let this man die by eating his favorite food slowly killing him and the last thing he hears will hunt him forever to his sin... Pretty good revenge to me.