Kokoro

Kokoro (ココロ) is the main conductor of the Sea Train, Puffing Tom, at the station just outside of Water Seven. She has a granddaughter named Chimney, who accompanies her everywhere. Kokoro is a heavy drinker, and speaks with a mild speech impediment that gives her dialogue a distinctive ring. Kokoro was once the "lovely" secretary of Tom, and a matronly figure to his two apprentices, Iceburg and Franky. It was she who revealed to the Straw Hat Pirates, Franky Family, and Galley-La Company foremen the existence of a prototype Sea Train, and she was also responsible for driving the prototype, called "Rocketman," as it sped on its way towards Enies Lobby. Her facial features make it look as if she is perpetually smiling regardless of her actual emotions. Her body shape, along with her strange smile, makes her look like a frog. (She is, in fact, an icefish mermaid, though resembles more of a dugong in terms of appearance and shape.) "Kokoro" translates from Japanese as heart, in the emotional sense, or emotion.

Chimney
Chimney is Kokoro's always-smiling daughter. She has blond hair in braided pony-tails, that stick up straight for some reason. She always follows her Grandma, Kokoro and is soemtimes a bit strange. For some reason, she never realized her Grandma was a mermaid, even though she saw obvious signs.

Gonbe
Gonbe is their pet Cat, who is a blue rabbit that has the same always-smiling face as Chimney.