As I watch the Fish-Man part of One Piece, they inform you that Otohime is a goldfish mermaid.
How was it possible for her to get around in the country without a bubble to help her? Since she's a mermaid and everything, she should need one since every mermaid and merman has one. So why didn't she need one?
Not only that, but she can run as well in the anime and it sounds like she's running on two feet when you get to her stopping the robber to slap him. Is it possible that she might not have been a mermaid because of that?