The manefestation of Tsuki's zanpaku-to. In order to tell the two sibling weapons apart, Tsuki dubbed that the male be called Tsuyoi and the female be called Ai (much to the woman's disapproval). Ai is the elder and very tomboyish and her ypunger brother Tsuyoi is mor of a "go with the flow" kind of guy. You can find the full picture at deviantart under my username RozettaMezzanotte.