Kōga clan

Kōga clan (甲賀一族, Kōga ichizoku) was the clan that was founded by the ; becoming one of the very first ninja clans, alongside their sister clan, the Iga clan. They inherited the Sage's "eyes", his powerful chakra and spiritual energy. The Kōga ninja were the first ninja to utilize dōjutsu, and over the centuries, their eyes developed into the modern day Sharingan and Mangekyō Sharingan.

Legacy
Just prior to the births of Madara and Izuna Uchiha, the Kōga clan dissolved, and those with the clan's kekkei genkai, the Sharingan, joined to form the Uchiha clan. By the time of the, it is believed that all remaining members of the original Kōga clan have died, causing the clan to be considered extinct.