This is something that I thought was hilarious and also...  somewhat thought
provoking, that I found on a message board.
<<It has come to my attention that Dr. Tofu seems to completely disappear
after the first season.  I have also noticed that in the ending song for An
Akane to Remember OVA (I think) that you see Dr. Tofu for a very short time.
 If you notice, he is wearing a black suit and black sunglasses.  If you have
recently seen the movie Men in Black, Dr. Tofu wears the same outfits that
the MIB wear.  I have come to the conclusion that Dr. Tofu has now become a
MIB.  It would explain his mysterious disappearance from all Ranma episodes
after the first season.  It would also explain why he was stalking Kasumi in
the OVA ending credits.  That is probably also why nobody seems to remember
Dr. Tofu.  They used that red-light-flashing-memory-erase thing on most of
the Ranma cast.  They'll probably use it on me soon too, after they know that
I've found out their plans.  So please keep this message safe, for further
reference.  Thanks.

~ TxdoCabbit
The ever paranoid.>>
You know, I think there could be a Ranma/MIB crossover fanfic in here
somewhere....  ^_^  Best theory about what happened to Dr. Tofu at least...
Jya Ne,
Shiaw Chi "Hokodan"