## One Piece Chapter 616, pages 9-9: Anniversary of Revenge - Chapter: 616 - Pages: 9-9 - Characters: Den, Franky, Tom ### Summary Page 9: Den introduces himself as a shipwright and ocean researcher: "The name's Den!" He is identified as "Shipwright and Ocean Researcher Den (Tom's younger brother) (Wolffish Merman)." Franky jokes that Den does not look like a merman, and Den replies, "Right, Den-san. Still, you really don't look much like him, huh...? I mean, you're a merman... and not even a puffer fish..." Den explains that this is a human way of thinking. Many surface species resemble their parents, but fishmen and merfolk carry a long memory of their genes. If an octopus mermaid gives birth to a shark merman, it means somewhere far back in the family tree there was a shark merman ancestor. On Fish-Man Island, "it's practically impossible to predict what a child will look like just from looking at their parents," so people are classified by appearance. The explanation broadens the arc's biology and culture rather than advancing the fight.