
Warning: Contains spoilers for One Piece chapter #1137. A lingering question within the One Piece community revolves around the true nature of Kaido. Is he merely human or does he belong to another species? His incredible resilience and horned appearance, along with his comments to Yamato identifying themselves as ogres, have fueled speculation about his lineage. Unfortunately, this enigma surrounding Kaido’s heritage remained unresolved before his defeat, which has left fans eager for clarification.
Amid the ongoing Elbaph arc, hints may be emerging that could reveal the truth about Kaido’s lineage. Although Kaido has yet to make an appearance or be mentioned in this arc, fans have noted a character that strikingly resembles him. This connection has led to theories suggesting that One Piece chapter #1137 foreshadows a significant revelation about Kaido’s parentage, hinting at much deeper mysteries than previously assumed.
Indicators of Kaido’s Royal Connection to Elbaph

In chapter #1137, readers are introduced to the deceased King Harald of Elbaph, whose rugged features and spiked beard evoke a strong resemblance to Kaido. While Eiichiro Oda’s artistic style may lend itself to character similarities, the narrative significance is heightened by Harald’s own ancient giant heritage, complete with horns. This suggests a potential lineage link, leading to the intriguing possibility that Kaido may indeed be a descendant of the ancient giants—potentially even the son of King Harald.
If this theory holds true, it has profound implications for Kaido’s characterization and narrative trajectory. The potent powers displayed by characters like Oars and the Numbers could be attributed to ancient giant ancestry, potentially explaining Kaido’s formidable strength and durability. Furthermore, as the Elbaph arc progresses, the emphasis on Harald’s legacy leaves the door open for Kaido’s storyline to intertwine with his father’s past, potentially resurrecting him within the plot, whether in flashbacks or through direct involvement—offering a fresh avenue for character development.
The Complexity Behind Kaido’s Alleged Half-Giant Heritage
Scrutinizing the Theory: Gaps and Contradictions





While the theory positing Kaido as a half-giant appears straightforward, the reality is far less clear-cut. Oda notably mentioned in volume #57’s SBS that horns are commonplace among certain individuals, suggesting that they do not inherently denote special lineage. Although Kaido is considerably large, he does not reach the towering heights of acknowledged half-giants, such as Colon and Big Pan, indicating a possible discrepancy in the half-giant narrative.
Nevertheless, the presence of horns—while generally inconsequential—takes on a new significance within the context of the Elbaph arc’s focus on ancient giants. The parallels drawn between Kaido and King Harald leave room for speculation. Currently, nothing within the One Piece lore conclusively negates the theory that Kaido might indeed be the offspring of King Harald. As the Elbaph arc unfolds, fans remain hopeful that the narrative will soon clarify Kaido’s true origins.
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