The Medicine Seller, known as Kusuriuri in Japanese, is a mysterious wandering figure central to the anime series Mononoke. He is an enigmatic character who travels through Edo-period Japan, exorcising malevolent spirits known as 'mononoke.' Armed with a mystical sword that can only be unsheathed when the truth, form, and reason of the mononoke are revealed, the Medicine Seller possesses an otherworldly calmness and intelligence. His role is pivotal, as he delves deep into the psychological and emotional turmoil of those affected by these spirits, ultimately seeking to bring peace and understanding.