[tomiko8]

hmm well as alot have mentioned deff ayu namie and kuu. about two years ago i would have said ai otsuka (especially after her second album and her song planetarium being played in hana yori dango).lastly i would say Hitomi as well only because she's like a veteran (now that i think about it namie is kinda in the same boat the only difference is that she's still active.) with her popularity running from early 90's to the early 00's she was able to bounce back alot after breaks and children which alot of artists in Japan have a hard time doing that . but its also your perspective too, people like misia, as someone mentioned may not have the diva attitude with the phone/drink/makeup product endorsements but a very strong fan-base and presence. personally Chihiro onitsuka will always be a diva for me because of her artistry and you her voice is amazing