You wrote: 

Who's Kiyone, though?  [...] 
I've not seen the Mihoshi special, so I don't know if she's from 
there, or if you created her.  If you did, good job.  An excellent 
foil to Mihoshi's antics.    

Kiyone hasn't had a "real" appearance in the OAV universe.  She was 
Mihoshi's partner in the Mihoshi Special, which was a story told by 
Mihoshi, who was obviously not remembering it very well and making up 
at least 50% of everything she said.  (She was also the villainess in 
the Pretty Samy music video, but that doesn't count... :-) )

What do we know about her, *counting animation only*?  Not much.  We 
know she's very level-headed and that Mihoshi is slowly driving her 
mad, but that would be true for just about anyone.  :-)

So, that pretty much allowed me a free hand to craft the character.  I 
decided to cast her as a stuck-up overachiever whose life is turned 
upside down when Mihoshi enrolls in the academy.

------RM