Principal Kuno speaks in basic Japanese, using a lot of English phrases 
(in and of themselves) and words (inserted in Japanese sentences.)  An 
example from his song on the Uta Karuta album:

Ranma no ALBUM  kiiteiru YOU tachi ni BIG na PRESENT arima---su
Sore wa ME no WONDERFUL na GOOD SONG de---su.

Rendering this in English is... scary.  Probably the easiest way is to 
have him pepper his speech with Hawaiian phrases, as his strange speech 
habits were picked up on his trip to Hawaii.  Go listen to some Don HO, 
have him sing Tiny Bubbles, whatever.  Favorite pet English phrases 
(which you can use by themselves) are "Goddamn," Hello, My students..." 
and "Oh my God!" -- he also calls Ranma and the other students "boy" or 
"girl," (depending) and tends to be very cheerful, even when saying 
something tremendously vicious or stupid.

Strength to you.  You'll need it.

mata ne,
bengman

bengman ***  "On the appointed day, I notice something amazing. When I take a 
step outside the vacant lot, a meadow spreads out before my eyes.  And there 
are lots of horses and cows staring at me. Since when has there been a ranch on
Akane's street? -- Where the heck am I?!" -- Ryouga, "Ittai koko wa dokonanda?"
 
On Fri, 8 Nov 1996, Jang Choe wrote:

I just can't seem to figure out how Principal Kuno talks. I am having a 

great deal of trouble trying to write a dialouge with him.  Does he always 
talk in the Hawaiian vernacular, does he actually talk normal, does he talk 
formaly like the rest of the Kuno's, or what?  Also, anyone know how old he 
is?