"Foxfire Kin'emon" is a samurai from Wano Country whom the Straw Hat Pirates found in various pieces at Punk Hazard. He is a retainer of the Kozuki Family. He posed as Momonosuke's father after Kozuki Oden's death. Kin'emon's appearance matches the stereotype of samurai found in ancient Japan, with a black topknot and goatee. He is quite tall, about the same height as Brook, who stands at 277 cm (9'1"). He is also quite muscular, but not overly so. 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. He has the crest of the Kozuki Family tattooed to his back.
Kin'emon seems to follow the code of bushido, claiming he would commit suicide if he could, for the disgrace of being dismembered without dying. He still tried to maintain his pride, even after being completely dismembered. Like Momonosuke, Kin'emon is very stubborn, constantly refusing the help of others and claiming he doesn't need it. Only after nearly freezing to death did he finally forsake his pride and ask for help. He is also greatly honorable, as shown when he bowed before Sanji (in Nami's body) for saving his torso and thanked him for helping him, stating he was indebted to him. As shown by his constant refusal to accept help from Sanji and own claims, he holds a strong dislike for all pirates. He also stated that he cannot stand the sight of dragons. He also seems to be very quick to judge things, believing Zoro to be the one who robbed Ryuma's grave after seeing his sword Shusui sheathed at his waist, and refused to listen until he was distracted by Sanji. He is a very old fashioned samurai warrior who expects women to walk three steps behind men and talk gracefully and quietly. He, on many occasions, referred to Nami as a shameless, violent and obscene woman due to her careless behavior. He felt disgraced when he got hit by Nami on his head. It is not yet confirmed if this is the traditional code of Wano Country or if it is his personal expectations of women. Kin'emon talks in a very old fashioned way, probably a result of his shut-in samurai life in Wano Country. He has a tendency to be quite perverted in spite of his sexist ideals.
Though he seemed to be outraged at Nami's sense of fashion, he still greatly enjoyed ogling at her cleavage. He also showed his anger and jealousy at Momonosuke bathing with Robin and sleeping in the same bed with Nami and Robin. He also has an extremely rude special ability of talking with his farts. He cares deeply for Momonosuke, as he traveled to the dangerous Punk Hazard island and challenged one of the Shichibukai in order to find him. Even after being chopped to pieces, his torso and legs still attempted to look for him and attacked anything that got in the way. He cares enough about him to the point that when he thought that Momonosuke was the small dragon he had cut down earlier he rushed back to save him, despite the incoming gas. He seems to be unaware of Devil Fruits, as he said he ate a strange fruit, instead of stating the correct name. Also he seems to be unaware of some stranger abilities, because he classifies everything unusual as ninjutsu or sorcery. He also seems to be unaware of other modern things, including dishes like pizza. Kin'emon is a loyal retainer for the Kozuki Clan, and cares deeply for the heir, Momonosuke, as shown when he traveled to Punk Hazard and challenged Trafalgar Law, a Shichibukai, to get him back. The two pretend to be father and son to protect the young daimyo from the Donquixote Pirates and other enemies. When Momonosuke returned to human form, the two tearfully embraced with each other, happy to be reunited. He also explained to his "son" that even warriors get hungry, convincing him to eat the food Sanji prepared for the group. Despite stating that he detests dragons, his staunchness for his young lord was greater, as he did not reject him for being able to turn into a dragon. Momonosuke also held great concern for Kin'emon and sorrowfully burst into tears when he thought Kin'emon was killed by Shinokuni poison gas despite Momonosuke's tough upbringing as a samurai. However, he is not immune to being angry and jealous of his young lord, as Kin'emon became enraged when he found out Momonosuke was bathing with Robin, telling him to cut off his topknot to repent, proclaiming him as the worst kid, and cursing him out in his thoughts, when Momonosuke is sleeping in Nami and Robin's room. Despite the two not being related, the Straw Hats noted that they looked alike and shared the same perverted traits.