Board Thread:General Discussion/@comment-11398218-20140521105018/@comment-4310945-20140525230036

MilanVukas wrote: Knowing Tite Kubo, Yachiru will most likely return as a fully grown woman with busty figure ( take Nelliel and Yoruichi as an example).

That could be her Bankai, it's so powerful that it makes Yachiru grow up when she uses it so she has to take her clothes off.