Hattori Hanzo is a legendary figure in Japanese history and folklore, often associated with being a highly skilled ninja and swordsmith. According to popular accounts and legends, Hattori Hanzo was a renowned ninja and samurai who served under the Tokugawa clan during the Sengoku period in Japan.

However, it is important to note that the line between historical fact and legend becomes blurred when it comes to Hattori Hanzo. While historical records do mention a figure named Hattori Hanzo who served the Tokugawa clan, the details surrounding his life and accomplishments are subject to speculation and embellishment.

Regarding Hattori Hanzo as a swordsmith, it is widely believed to be a fictional portrayal attributed to his character in modern popular culture. In movies, such as Quentin Tarantino's "Kill Bill" series, Hattori Hanzo is depicted as a master swordsmith who creates exceptional swords. However, in historical accounts, there is no substantial evidence to support Hattori Hanzo's existence as a sword maker.

In summary, Hattori Hanzo is a historical figure who has become a legendary character in Japanese folklore, associated with both ninja skills and swordsmithing prowess. While he did serve as a samurai under the Tokugawa clan, his identity and achievements are often shrouded in myth and exaggeration.