Due to being a child, Momonosuke was quite short. While his unshaven hair was black like his father's, the portions of his hair that were shaven were turquoise like his mother's and sister's.

In his prior appearance as an 8-year-old, Momonosuke matched the stereotype of samurai found in ancient Japan, with a topknot and the top of his head shaven. He wears a light, peach-colored kimono with the Kozuki Family crest on it colored red, and with a flame and cloud pattern on the bottom of the kimono, as well as a dark cloak lined with crescent moon designs, which is also a Kozuki symbol, and now carries his father sword, Ame no Habakiri as well. He is quite tall, with Shinobu and his sister Hiyori (who stand at 180 and 170 cm respectively) reaching up to around his chest level. Unlike Oden, Momonosuke's hair is not styled on the top of his head, being unkempt everywhere, and he currently lacks any facial hair. Momonosuke heavily resembles his father Oden (something that Shinobu noted), having a similar facial structure as well as the same long and wild mane of black hair (including on the top of his head which was shaven as an 8-year-old). He is a major ally of the Straw Hat Pirates during the entirety of the Dressrosa and Wano Country Sagas. His given name was revealed when the samurai was asking if the captive children in the Biscuits Room had seen him, and his clan name was revealed when Kin'emon spoke of his true heritage. He was first mentioned when Kin'emon told Sanji that he came to Punk Hazard to rescue his 'son'. The Ninja-Pirate-Mink-Samurai Alliance emerged victorious from this war, and Momonosuke attained his rightful position of shogun to unanimous support from the Wano citizens he would go on to be renowned as one of Wano's greatest leaders. To be of better use during the conflict, Momonosuke had his retainer Shinobu use her Juku Juku ability to age his body 20 years, though he remains a child mentally. Throughout their voyage, return to Wano, and climactic battle with Kaidou's forces, Momonosuke steadily grew to accept and assume his role as the leader of the Kozuki Family and their allies. To conceal his identity, Momonosuke pretended to be the son of his retainer Kin'emon.

Upon reappearing, Momonosuke and his men went out to sea to recruit allies for a planned battle against Orochi and Kaidou. To keep Momonosuke safe, Toki sent him 20 years forward in time with several of his retainers. Oden was executed when Momonosuke was 8, and Orochi and Kaidou began waging open warfare to eliminate the Kozuki bloodline. Though Momonosuke was rightfully the heir to the shogunate after Oden, the Kozuki Family was deposed by the Kurozumi Family during Oden's travels, and attempts were made on Momonosuke's life by Kurozumi Orochi's administration. Momonosuke was born 28 years ago while his parents were sailing with the Whitebeard Pirates. Kozuki Momonosuke is the current shogun of Wano Country, as well as the son of the late daimyo of Kuri, Kozuki Oden and Toki, the grandson of the former shogun, Kozuki Sukiyaki and the older brother of Kozuki Hiyori. Artificial Mythical Zoan For the chapter that also includes his title, see Chapter 1051.

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