>>43774081She was designed as a small, loli-esque character with a small chest.
However the rigger misunderstood the torso area and thought those bits on the side indicated she had giant boobs and rigged her that way, resulting in her having huge tits that jiggled around when she moved, which got her quite a bit of attention initially.
Anya was quite firm in regard to sticking to her artists original design intention and was quick to correct people that she wasn't meant to an oppai loli. On her new models this mistake was corrected.