Actually, she's the only character model. The customization is done with a dynamic texture made out of three layers (base, body art, outfit), along with seperate hair models (and multiple skins for each hair model). Additional attachable meshes are also possible, though they won't be used very heavily.
Of course, there will be more character models for the sequal, including males...
Of course, there will be more character models for the sequal, including males...