Loosely based on the famous folkloric Japanese thief Ishikawa Goemon, Goemon is portrayed as a fiery young man from Edo (present-day Tokyo), with a sense to always fight for what is right. Much like his historical inspiration, he was originally a noble thief, stealing from the rich and giving to the poor, thus amassing a bounty which attracted samurai and ninja to target him. Goemon soon turned into a normal hero, defending Edo from various threats, ranging from pirates to space aliens, leading to the Lord and Princess Yuki to pardon him. Goemon uses a variety of tools and abilities in his adventures, including a giant kiseru he swings as a weapon, throwable Ryō coins which can be enhanced with fire magic, a chain pipe (which acts similarly to a grappling hook), and the ability to push large blocks. He can also use a Triton Shell to summon the gigantic fighting robot Goemon Impact, constructed by the Wise Old Man, a brilliant inventor. Goemon's allies include the hammer-wielding ninja Ebisumaru, the sword-wielding kunoichi Yae, and the bomb-throwing robot ninja Sasuke, who was also built by the Wise Old Man.
As a costume
In the Mii Costume reveal trailer, the Goemon Mii is accompanied by a female Corrin, Pit and Dr. Mario. This references Yae, Sasuke and Ebisumaru, Goemon's companions and other playable characters in many of his games, including Mystical Ninja Starring Goemon on the Nintendo 64. The News blurb for the Goemon costume recommends using Shuriken of Light to approximate Goemon's Ryō coins.