For me, most of the mail I get (which isn't very 
much) usually concerns my Hotohori & Bandit cel. 
^_^; I think it's the only cel I've gotten more 
than two inquiries on by e-mail (and even a few 
at conventions from people who recognize me). 
Second up would probably be my Yui cels, how did 
she get so popular all of a sudden? o.o everyone 
used to hate her!