The Nidai Kitetsu is primarily associated with Monkey D. Luffy, who picks it up during the Wano Country arc. It was previously carried by Tenguyama Hitetsu, a swordsmith and descendant of the Kitetsu blade-making lineage. Like all Kitetsu swords, the Nidai is considered cursed — legend within the series states that every wielder eventually meets a tragic end. This dark reputation makes the Nidai a compelling narrative piece and a conversation-starting collectible, especially when displayed alongside Zoro’s Sandai Kitetsu to represent both characters’ connections to the cursed blade family.