I'll second Dan Mitsu. However, if she's done JAV, I haven't seen it. Off the top of my head, I remember liking Mayuri Hoshitsuki. Too bad she's retired.
Here's Mitsu. I got the pic from another site. I have to admit though, I'm all about the face in Mitsu's case.
My favorite ass type seems to only be on the american pornstars asses like jada stevens, alexis texas, remy lz croix, jenny hendrix, jessie rogers. THOSE are my favorite ass. Now i know this is not about american asses, but thats specifically why i typed all that, i would like to know if theres a JAV star with an ass like theirs. i know ive seen like one or two before but i dont know any names. and most of these stars dont get close enough to the big ol' bubble booty im lookin for. risa tsukino was awesome tho.
one of my favorites Saya tachibana, has an ass irresistible is of the most perfect asses I've ever seen one of my favorites Saya tachibana, has an ass irresistible is of the most perfect asses I've ever seen
Currently, Yuki Jin for me.
She's unfortunately now retired, but Nao Ayukawa too.
Strictly speaking, not a JAV girl (though she should be as she's got the whole package - Eyes, Lips, Boob, and an awesome butt) is this Latin/Japanese mix dancer named Yurisa.