There was a Sailor Moon/ Ranma 1/2 crossover in which (I believe) Ranma is sent back in time to the Silver Millenium during its fall, breaks free of his 'time bubble' insulation and fights on the side of the Senshi. During the encounter Ranma is referred to as a Life-dancer.
I remember neither the author nor the fic name, but I am hoping your younger and better memories can help me out and provide a link.