Ushiwaka is a young fisherman living in Zazen Town. In exchange for helping deal with Benkei, he requests the help of Goemon and friends to catch certain amounts of fish in the nearby creek. After collecting all the fish, Ushiwaka hands them the Achilles' Heel, a round log.
After defeating Benkei with the Achilles' Heel, he mentions that Ushiwaka defeated him in the same way.
Sometime after Goemon leaves Zazen Town, Ushiwaka ate the magic dumplings in the Golden Temple, effectively turning him into a dwarf. He remains this way for the rest of the game.
- Ushiwaka is based on the real life story about the encounter between Saitō Musashibō Benkei and Minamoto no Yoshitsune ("Ushiwaka" was the name he used when he was younger).
- According to one of the female residents of Zazen Town, Ushiwaka borrowed money for octopus dumplings and never paid her back.