"Foxfire Kin'emon" is a  samurai from Wano Country, a retainer of the  Kozuki Family, the leader of the  Nine Red Scabbards, the husband of  Tsuru, and a former thug. He was born 56 years before the present day, but traveled 20 years forward in time when he was 36 years old. 
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.
He is one of the central allies of the Straw Hats during the
Dressrosa and Four Emperors Sagas. 
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.
He has the crest of the
Kozuki Family tattooed on his back.
Over 25 years ago, he had blonde hair and did not wear it in a top-knot. It was only after Kin'emon became a proper samurai that it started resembling his current hairstyle.
Kin'emon's color scheme in the manga.
Kin'emon at age 15.
Kin'emon's first outfit at age 15.
Kin'emon's second outfit at age 15.
Kin'emon at age 23.
Kin'emon at age 26.
Kin'emon at age 30.
Kin'emon's second disguise during the Dressrosa Arc.
Kin'emon's third disguise during the Dressrosa Arc.
Kin'emon disguised as a Beasts Pirates member.
Kin'emon's lower body,
, after the effects of the
Ope Ope no Mi
Kin'emon's head after the effects of the Ope Ope no Mi.
Kin'emon's torso after the effects of the Ope Ope no Mi.
Kin'emon in comparison to Brook in height.
Kin'emon's concept art from the anime.
: Devil Fruit Based • Toki Toki no Mi † • Artificial Devil Fruit • Fuku Fuku no Mi • SMILE • Zou Zou no Mi, Model: Mammoth • Inu Inu no Mi, Model: Tanuki • Wara Wara no Mi • Uo Uo no Mi, Model: Seiryu • Juku Juku no Mi • Ryu Ryu no Mi, Model: Allosaurus • Ryu Ryu no Mi, Model: Spinosaurus • Ryu Ryu no Mi, Model: Pteranodon • Ryu Ryu no Mi, Model: Brachiosaurus • Ryu Ryu no Mi, Model: Pachycephalosaurus • Ryu Ryu no Mi, Model: Triceratops • Kumo Kumo no Mi, Model: Rosamygale Grauvogeli • Neko Neko no Mi, Model: Saber Tiger • Hebi Hebi no Mi, Model: Yamata no Orochi • Mane Mane no Mi † • Bari Bari no Mi †
Tori Tori no Mi, Model: Nue ≠
: Fighting Style Based • Ryuo • Oden Nitoryu • Kitsunebi-ryu • Ninjutsu
: Weapons • Shusui • Kitetsu ( Shodai Kitetsu * • Nidai Kitetsu • Sandai Kitetsu ‡) • Soto Muso • Enma ‡
Ame no Habakiri
Straw Hat Pirates' Allies
One Shots: • Silk • Ann and Balloon • Dragon Team
Toriko and his allies
Specials: • Medaka, Herring, and Skid • Meroie and Hamu • Maccus, Bonney, Amanda, Milia, and Holy • Randolph Theater members • Toriko and his allies • Dragon Team • Diego and Regis • Foxy Pirates • Kinoconda
Myskina Olga, Myskina Acier, Elizabeth, and Chavez
: Movies • Ganzo and Tobio • Akisu and Borodo • Mobambi and Karasuke • Adelle and Shuraiya Bascùd • Maya • Izaya • Lacos • Brief • Tearoom Pirates • Roba and Gonzo • Billy • Schneider and Buzz • Kuzan • Mobston and Gari • Z • Carina • Raise Max • Rikka • Worst Generation's Super Rookies • Smoker • Buggy • Boa Hancock • Sabo
Filler Arcs: • Apis and Ryu • Tajio • Kodama • Zenny Pirates • Pumpkin Pirates • Mekao and Kobato • Foxy, Porche, and Hamburg • Phoenix Pirates • Sayo, Lina, and Nukky • Yoko and Boss • Little East Blue residents • Panz Fry and Lily Enstomach • Sea Animal Pirates
Games: • Gejitsu Pirates • Atoli and Dias • Coe, Otsu, Hey, Tay, and Wadatsumi (Non-Canon) • Popora • Gaburi • Pato • Yadoya • Jeanne
Events: • Dragon Team and Astro Boy and his team • Dragon Team and Kankichi Ryotsu • Hakuto • Toratsugu • Igaram Jr. • Ann
Lance and Taylor