Dream Ami
Former member of E-Girls
Spotify Playlist
Hitomi Shimatani
Another veteran from the 90s
Spotify Playlist
DAOKO
A singer and rapper she's gaining a lot of popularity and has a lot of collabs
Spotify Playlist
Crystal Kay
Yet Another Veteran she's a japanese american she has great style
Spotify Playlist
MINMI
If you want a very upbeat and fun sound
Spotify Playlist
Thelma Aoyama
A pop and R&B singer. She is part Afro-Trinidadian and Japanese.
Spotify Playlist
BENI
I believe she's another japanese american artist, she has several albums with english covers of japanese songs and she just released her album CINEMATIC
Spotify Playlist
JUJU
Jazzy and Ballad artist with pop elements as well.
Spotify PLaylist
Mika Nakashima
I almost forgot about my beloved Mika, she has a mellow style like juju but she also does rock and pop.
Spotify Playlist
CHARA
Yet Yet Yet Another Veteran, chara just released a very nice album titled Baby Bump she's a cool style
Spotify Playlist
YUKI
Like Chara she has a very distinctive voice, she's more pop but she has some nice songs
Youtube TOP 30 best songs (previews)
Celeina Ann
Upcoming singer, she just released her debut album titled Departures
Spotify Playlist
Of course you need to listen to
Utada Hikaru,
Koda Kumi and
Kyary Pamyu Pamyu but that's a given
Also I recommend these Playlist in Spotify, they update it regularly with great artist not just ladies, you should subscribe:
TOKYO RISING playlist
And even if you didn't ask for it I follow this Indie K-pop playlist that has a lot of great female singers since now I'm more into Indie Kpop:
K-Indie Picks