Because I'm feeling loopy right now I'm having difficulty reading and comprehending. I've spaced out from sitting in front of my machine too long.
Er... sorry, that has nothing to do with favourite character as much as it's my excuse for basing my decision entirely on character design.
I like Saphirra's design the best. Seems to have the best expressions, and I could probably could recognize her if I met a real life version of her.