[*Petit*]

Only ayu and ayumi have really been constantly reinventing themselves, I wouldn't even place them in the same category as the other. BOth have done so with great success.

I voted for namie as well, I think commercially, market size taken into account, her transformation has been most successful commercially, maybe along with christinas. I don't think brits transformation was equally commercially successful, but then again she was so huge to begin with.