The specific individual who created the very first katana is unknown. The katana, a traditional Japanese sword, developed over time through the collective efforts of Japanese swordsmiths and craftsmen. It emerged as a distinct type of sword during the Kamakura period (1185-1333) and further evolved during the subsequent Muromachi period (1336-1573).

The katana's design, characterized by a curved, single-edged blade with a longer grip for two-handed use, was a result of the continuous refinement and experimentation by swordsmiths of that era. Various schools and traditions of swordsmithing, such as the Yamato, Bizen, and Soshu schools, contributed to the development and craftsmanship of the katana.

While the specific creator of the very first katana cannot be identified, it is important to recognize that the development of the katana was a collective effort influenced by cultural, martial, and technological factors of medieval Japan. The katana's evolution was a result of the continuous innovation and skill of swordsmiths throughout that time period.