Oniō and Dōzaburo, Sōga Brothers Vassals (Oniō to Dōzaburo, Sōga kyōdai no jyūsha, 鬼王と道三郎、 曽我兄弟の従者).

Also known by the name of Oniōmaru and Tanzaburō they enter the scene from the second half of the story, helping the Sōga brothers in their quest for revenge.
Despite costing them their own life the Sōga brothers eventually succeded in avenging their father`s death.
After few debates over their real existence, Oniō and Dōzaburo (even if probably under different but similar names) have been acknowledged as real and are now remembered for having brought back the brothers memento to their mother and spread their memory across the nation.