Ai Otsuka (at first she was cute, but then... it came to look fake in my eyes)
Yuna Ito (amazing vocal, but last album is really terrible)
Namie Amuro (ok I liked only few of her songs, but still I really dislike her now)
May J. ( I still love her but her RNB period was awsome, now she's average
)
SoulJa (love comes and go, it depends on a release lol)
I almost havent realized you said 'ASIAN' not japanese only. So, I'll edit my list:
Gem Tang (I died when I first heard her, and her mini album was super epic, then... her first album was... kinda like boring to me, I think I overplayed her)
Kay Tse (I still like her, but I wish for more variety in albums)
Fiona Sit (I overplayed her too, lol )
Myolie Wu (both mini albums are super awsome, but it would be a nice dream If she would dedicate herself to music only, this is like.. more money in her pocket, singing is like hoby to her)
Show Lo (if it aint no Rainie Yang I would never give him a chance, he's overrated imo. I like only 3 songs now from his latest album)
Ivana Wong (I would like for her to surprise me)
Rachel Liang (I was so happy she's releasing second album when.. only singles were nice
)
Theresa Fu (please come back!)