Uhm Ranka for now isn't becoming bitchy and I highly doubt she will become. She's hiding some big secret (=her flashing chest IS NOT normal!) and has the military after her: she has a huge disadvantage compared to Sheryl yet she hasn't became bitchy against her or Alto. Anyway I consider her like some kind of little sister because she's way more childish than Sharyl, who is very beautiful and sensual in evreything she wears and in evreythign she does. And she isn't bitchy really, it's only a cover to protect her sweet, fragile and thoughtful personality.