Eiichiro Oda has intricately crafted the enchanting universe of One Piece over the years. Among the many enigmas within this epic tale are the legendary treasures of “Captain”John from the Rocks Pirates and the unique background of Eustass “Captain”Kid.
The speculation surrounding a familial bond between Captain John and Eustass Kid is particularly intriguing, as it aligns with numerous visual, narrative, and thematic elements. This theory not only sheds light on Kid’s origins but may also reveal the true essence of Captain John’s renowned treasure—specifically tailored for a person with magnetic powers like Kid.
Disclaimer: This article features a speculative theory and represents the writer’s perspective.
Eustass Kid and Captain John: A Hidden Connection
In a series where character names carry weight and meaning, it’s noteworthy that only two figures are distinguished by the title “Captain”: Eustass “Captain”Kid and “Captain”John. This intentional naming convention hints at deeper connections between the characters, a method Oda commonly employs.
While Kid bears the Eustass name, he retains the “Captain”title, subtly acknowledging his possible lineage. The visual similarities between him and John are unmistakable. Both characters are seen in long captain cloaks adorned with light edges and button-up shirts, and they share a remarkable resemblance through their jewelry—specifically, the golden bracelets on their left arms that could symbolize a familial bond.
Furthermore, their hairstyles echo each other; Kid’s spiky “Jaggy”hair appears reminiscent of John’s unique upward hairdo. The striped pants worn by Kid have a striking similarity to those of Captain John. These abundant visual cues suggest there is more to their connection than mere coincidence.
Unveiling Captain John’s Treasure: A Legacy for Eustass Kid?
Captain John’s iconic treasure, which lies concealed in a cave, takes on an intriguing dimension when viewed alongside Kid’s unique abilities linked to his devil fruit. The treasure likely consists of “Liquor Iron Ore,”a rare and valuable metal that resonates with John’s notorious reputation as a heavy drinker, constantly “hammered, before and after death.”
The Jiki Jiki no Mi (Magnet-Magnet Fruit) connects seamlessly with this rare ore, implying that John may have set it aside as an inheritance for his son. Interestingly, the ornamentation on John’s treasure marker bears striking similarities to Kid’s childhood appearance—such as circular designs echoing goggles and spikes that resemble Kid’s hairstyle—which might indicate that John crafted the marker with his son in mind.
Eustass Kid’s Legacy and Connection to Captain John
This theory reframes Kid’s actions throughout the series. His pursuit of weapons and maintenance of multiple ships is indicative of involvement in extensive metal weapon distribution. Moreover, Kid’s acknowledgment of Doflamingo as “Joker”within the underworld hints at deeper connections with the black market.
Significantly, the Revolutionary Army has encountered weapons crafted from Liquor Iron Ore being circulated among wartime nations—something Kid, with his magnetic capabilities, would excel at producing. This narrative opens intriguing storytelling opportunities; for instance, Kid’s resentment towards Buggy becoming an Emperor could stem from Buggy’s quest for his father’s treasure.
After Burgess’s raid on Baltigo, which involved their Liquor Iron Ore weapons, any future conflict between Kid and the Blackbeard Pirates could become particularly intense. Access to refined Liquor Iron Ore may enable Kid to advance beyond his usual scrap metal use, potentially increasing his combat capabilities significantly.
Conclusion

The hypothesis involving Eustass “Captain”Kid as the offspring of “Captain”John highlights a fascinating hidden connection within the elaborate landscape of the anime. The shared epithet, visual resemblances, and a synergistic link between John’s treasure and Kid’s abilities create a robust and compelling narrative.
If this theory holds true, it would further enrich the generational themes that Oda has expertly woven into the saga, illuminating Kid’s powers and his fascination with weaponry as the series moves toward its climactic conclusion.