Miko Shirogane, is a supporting character  and one original character of the Powerpuff z.. She's the most talented at everything. She appeared in only one episode,Demashita! Shirogane Z and she's represented as Himeko Shirogane older sister.

While Miko appears kind towards her family, she hates the Powerpuff Girls Z, jealous of them and went as far as to bribe Mojo with gold to help her do her dirty work. Miko loves to show off and her main reason for returning to Tokyo was to show off to the city and she succeeded. But all in all, Miko is sweet-natured to her family and a evil mastermind to everyone else.