

In the original manga, Goemon is one of Lupin's targets he wants to steal the secrets of how to make Goemon's sword, or in the American release, the secret on how to make gold. It was thought that Goemon was either based on Soshi Okita, a 19th century samurai who was also a noted swordsman (and who is also a character in another Monkey Punch manga, Bakumatsu Yankee) or Kyūzō from Seven Samurai (who Britt, the Magnificent Seven character Jigen was based on, was inspired by).

The idea was later done for Part 2 Episode 23. His original plan was to have a descendant of Nezumi Kozō, however, famous manga artist Osamu Tezuka had already come up with the idea. Monkey Punch came up with Goemon as he felt like the manga needed a more Japanese character.
