Namie Amuro-Mariah Carey
They both made their comebacks in 2005. And They've both been around since the early 90's. Both Mariah and Namie's careers flopped majorly however they came back and indeed had a new urban feel to their music. Plus Mariah alwasy has that blonde hair as does Namie with her warm brunette colored hair.
BoA-Lady GaGa or Ciara or BoA
BoA is talented in the dance department and also has a good voice on her. Ciara like BoA is real flashy/stylish. She can dance and sing as well.
Utada Hikaru-Utada
self explanatory
AI-Eve
both keep it gangsta XD j/k
Koda Kumi-Fergie/Britney Spears
Koda is a confident singer making music she likes and made up her own style(ero-kawaii) instead of being a replica of the many jpop female singer in the industry. Fergie too did her own thing following her own rules and style which made both Koda Kumi and Fergie so popular.
Ai Otsuka-Hannah Montana
Both cute singers whose target audience is children.
Misia-Jennifer Hudson
They both have super strong voices that gives you goose bumps. Music is soothing and refreshing.
Mika Nakashima-John Legend (sex change)
Very mature style in their music.
There is only one B and it's Beyonce and I'm not even going to start with Ayumi and Madonna.
