This was my fav part to do- was like, "yknow when someone gets blasted by blue/white light in DBZ and they crumble?" and I said "yes absolutely" and designed a three-part transition, from being washed out to blasted and obliterated.
The lead animator started the designs out with flat colors, and from there I made a style guide for the lighting, shading, line coloring- basically everything to make it pop more. I'd take closeup shots and rough out how the shadows should look in-scene.