Due to Wano Country having been taken over by Kurozumi Orochi, an ally of Kaido of the Four Emperors, Kin'emon set out on a seafaring quest to recruit warriors for his cause, bringing alongside him his master, Kozuki Momonosuke, as well as two of his comrades. After a series of misadventures, Kin'emon ended up on the island of Punk Hazard, where he met and joined forces with the Straw Hat Pirates, posing as Momonosuke's father during the journey to Zou.
Kin'emon's appearance matches the stereotype of samurai found in ancient Japan, with a black topknot and goatee. At 295 cm (9'8"), he is taller than Brook who stands at 277 cm (9'1"). He is also quite muscular. His eyes are asymmetrical, with his right eye opening more than his left.
His attire consists of a samurai gi that is black and white striped on the left side and orange on the right. Kept on the left side of his torso is a pair of katana with identical flame-patterned sheaths. For footwear, he wears simple geta sandals.