You mean who has the biggest octave range? High pitched voices don't mean anything for actual notes, it just means when Maachan sings the same note a Haruna, it'll sound squeakier. I'm actually unsure of Maachan's range THOUGH she may be the best bet.
Surprisingly not a lot of girls in H!P right now can hit the higher octave reliably. I'd actually have to do some studying and get back to you on it.
No, resop is asking if anyone sings octaves above the rest... Aka, if they sing the same note, it'll sound more high pitched because one has to sing an octave higher. so like girl 1 sings C1 but girl 2 sings C2. (an octave higher.)
NoBerryz,NoLife. Please people, I'm a "he" not a "she".