Kokoro, One Piece Wiki

Not to be confused with Kokoro no Chizu, the 5th opening song Kokoro is an icefish mermaid and the stationmaster for Shift Station, a Sea Train station near Water 7. She was also Tom's secretary during the days of Tom's Workers. Kokoro poses as a human, hiding her mermaid physique because her tail fin forked in two around the age of 30 and allowed her to walk on land. She has a granddaughter named Chimney, who accompanies her everywhere. She is an ally of the Straw Hat Pirates during the Water 7

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