Kurosaw Dia is a 3rd year in Uranohoshi High.  She's very mature, reliable and strict. She comes from a rich, traditional family and cares a lot about her little sister, Ruby. She idolized Ayase Eli and is a hardcore Muse fan.
Her image color is red.
Her voice is deep and mature, but rarely shows off emotions.
(Dia's solo song - https://www.youtube.com/watch?v=RsVTGzVnomQ)
In the group she'll be taking Eli's lines in the full unit and Umi's lines in the sub-unit (Lily White) songs.