One Piece's Wano Country Arc is the longest in anime history, giving the sequence plenty of time to showcase the series' large cast of characters. One of the most important individuals during the arc is Kozuki Momonosuke, the young boy that joins the Straw Hat Pirates during the Punk Hazard Arc. At first, Momo lies about his true backstory, but as he spends more time with Luffy and his crew, he reveals more and more about his history. Eventually, it is revealed that his guardian, Kin'emon, isn't actually his father; rather, Momonosuke is the son of the legendary swordsman Kozuki Oden, who previously served alongside both Gol D. Roger and Edward Newgate.
Source：https://www.cbr.com/one-piece-kozuki-momonosuke-powers-abilities-explained/
