The Wakizashi can be upgraded using Smithing Stones and can be infused with Ashes of War. “Short sword with a tempering pattern on the blade. A weapon unique to warriors of the Land of Reeds.

The two swords ... Kyraku's twin Zanpakut do not manifest from a single normal blade in the way Ukitake's do; he uses his tachi (the larger more ubiquitous katana) and wakizashi (a shorter blade ...