Kyushima Misachi

 
Kyushima (久嶋): Kyu means long time or old story. Shima means island.
Misachi (美さち): Mi means beauty. I'm not sure if sachi at the end changes the meaning. Its a common female name. Misachi would spell it in all hiragana (みさち) when with Dreamusic. Currently it would seem shes spelling it as "MisaChi".

Asuka Riri

 
Asuka (飛鳥): Asu means fly or scatter. Ka means bird.
Riri (李哩): The first Ri means plum. The second Ri means mile.
Note: Since her official site is gone i can't guess the kanji accurately, but last.fm has this one. With her official site gone and her myspace still being under MisaChi, I'm assuming she is no longer going by this.

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