Keeping it easy:
Saki - Saki is my fav
She reminds me of Aurica a lot at various times, and her wedding dress really reminds me of Aurica's. Above the waist I mean. That, and Sarapatra is hilarious
I mean who thinks up a mock wedding as a gag?
And makes a perv squirm the whole time too
Sarapatra's dress is really cool & hot too
Tyria - The coolest origin period. I like her wiseass remarks and general cooky weirdness. The three origins needed some face time together, that's all I'm saying.
Reika - Doctor~!!!
Got to be the most hilarious female in the series. Well, maybe Spica was funnier, but that's a different matter.
Cocona - Just because she's Cocona, and she's cool
Aoto gets points too for having a more "average guy" personality than Lyner & Chroah.