I tried to look at it objectively, and dear Hana seems to be the logical choice.
Emi's characters are always off-limits
Edra's probably going to turn out straight
Avianna's the queen of the flying twatwaffles
Mei seems to get Siegfried's big brother instinct activated (it is, after all, his protectiveness of her that is about to turn the house into a battlefield on day...)
Kyoko and Jamie have both departed for parts unknown
Hana, meanwhile, is pretty, kind, caring, and has the kind of personality that really gets my (character's) motor running. I just can't wait till that date comes around; it's going to be entertaining, to say the least...