My mother lived and worked for a while in Japan and her stories from that time resemble what you have in mind I guess
She was all "wtf o_O" when the people in her group started to get ecchi. And showed her disapproval openly .. fierce one, my momma.
The only character I can think of going in that category is that blondie from
Sayonara Zetsubou Sensei, that resents everyone around her as perverts (in her mean persona). It would be nice to see a 'normal' foreigner. Maybe even one who never heard of anime and thinks of Japan as a weird, weird country and has problems fitting in xD
But I guess the hypersexy foreigners will stay as the default.