aaaah there are a few more ~
Asane Hana Anemone, Nolae Kimochine Quiet, Nyui Anna Coquette,唱地ヨエまどろみ(don't know her name in Romaji) , Crina_rain,Hakupo and Kiei Calm.
Theres also utau's like Desune Moralix WOLF and MIKA-03 hishihishi , who have very soft lows but powerful highs