A few suggestions, now that I've thought about it:

Ranma - Sheridan
Akane - Ivanova
Ukyou - Delenn
Ryouga - Garibaldi
Akari - Talia
Konatsu - Lennier
Kunou - G'Kar
Cologne - Kosh
Nabiki - Morden
Shampoo - Lyta Alexander
Tofu - Franklin
Kodachi - Anna Sheridan
Mousse - Bester
Happosai - Londo
Pansuto Taro - Vir
Shinnosuke - Marcus
Sinclair - Keiichi Morisato (AMS)

A few explanations - Akari as Talia works for me.  Ryouga would
have a crush on her, just as Garibaldi does.  Plus, after Divided
Loyalties, maybe we could work in someone new.

Kunou seems to me to be the only one to pull off the tortured 
belligerence and dignity that is G'Kar.

Shampoo as Lyta came to me in a flash.  Very close to Kosh, works
with Bester...works for me.

Kodachi as Anna...well, we haven't even met Anna yet.  But why
not?  Sheridan could be going to Zha'dum to verify that she's dead!

Mousse has the snake-oil charm to carry off Bester, he just 
doesn't use it much.

Happosai as Londo is weird, I'll admit.  But he'd sell his soul 
for revenge more than any of the others.

Shinnosuke as Marcus...I would *love* this!

Keiichi as Sinclair...well, why not?  We could have him go back
in time to meet Belldandy!  Seriously, he just seems right to me.

--Sean Gaffney
--What do you want?