So far all the Figmas i own have hidden butts, where they are hidden by their clothes. Granted if you're one of the up-skirt kind of people, you won't be too impressed with the crotch area but they are cleverly hidden and won't be noticeable unless you're a perv.
And i've long been a fan of Masaki Apsy aka F-Face who sculpts for Figma. Yamaguchi (kaiyodo) is good too but only for his non-female figs.