I can't believe I actually thought about this hard enough to make a
whole cast list...

My choices would be:

Frank: Ranma

Brad: Dr. Tofu

Janet: Kasumi

Rif-raf: Mouse

Magenta: (this was a toss up) Shampoo or Ukyou

Columbia: Akane

Rocky: Kuno

Eddie: Ryoga (classic for the dinner scene, neh?)

Dr. Scott: Genma

The Narrator: Soun (can you picture him demonstrating The Time Warp?)

Is someone actually insane enough to attempt this?

Windlily

(dementeddragoncritter@theCelestialTemple.com)