Since everyone's doing this:

Brad: Ryouga
Janet: Akari
Frank: Tsubasa
Eddie: Ranma
Columbia: Akane
Riff-Raff: Kuno
Magenta: Kodachi
Dr. Scott: Genma
Narrator: Happosai
Rocky: Hmmmm...Shinnosuke?

--Sean Gaffney
--Akari fan...duh