Voice: I want either a Sayaka Miki approach, where you have a mezzo nasally voice that is powerful and mature, or a Mimori Togo (whose voice actor plays Umi) approach where it's a beautiful alto voice that is mature.
I want them to bring maturity to the group, one of the deeper voices, that is either a Maki or an Umi, and sound very grown-up and beautiful! Their voice should be a definite strength to the group. I need a Cool personality for this one.