If it rains, Hiko-nyan appears at the Castle Museum. Hiko-nyan is a white cat wearing a red samurai helmet with horns, modeled after the one worn by Lord Ii Naomasa, the first lord of Hikone Castle.
Hiko-nyan also makes guest appearances at various events to promote Hikone. He has even traveled to Hawaii to appear in a Japan parade in Waikiki.