The types for a lot of girls are rather arbitrary. I've given up trying to figure out the system for determining why certain idols are classed the way they are and accept that most of them are based entirely on whim.
My theory (well, headcanon) is that the idols themselves, largely, select their types; this is taken from a comic -- which I can't seem to locate right now -- in which the Positive Passion girls are talking, and the conversation turns to why they all chose to be Passion-type idols. Mio says something about wanting to be sexy, and Akane says something about her hot-bloodedness. Aiko, on the other hand, is trying frantically to think of an explanation that doesn't reveal that she thought the option read "Fashion".
When some-thing is fresh and livelySo, Ishikawa Prefecture!Okay, readyWhen a snowy road is slipperyNamanama.Rin Shibuya here, today we're in Ishikawa to introduce these newcomers14 years old, 2nd year in middle school! Hayate Hisakawa~! And this is Ha's older twin sister, Nagi♪...It's as my little sister says. I'm the big sister Nagi. Not negi (onion), and not kugi (nail) eitherFor this, Uzuki Sensei has prepared a Kanazawa dialect quiz for you two!I'm getting a major 'get them before they get you' vibe here~What does 'kinkan namanama' mean~?Huh, that was fast... Okay, Rin-chan, what's 'kitokito'!?Talked about this when they had a live show here beforeNamanama?
Correct... Whaaat~!? You two are amazing! Did you study for this?I know it from Nono, but... Uzuki, you know Kanazawa dialect from Miho and Kyoko, don't youI know it from Aa-chanSeems we have the same source of infor-mation~
Cinderella Girls Theater
劇場第1271『石川に来ました!』
Theater Episode 1271 - We came to Ishikawa!