Medaka Mermaid Quintuplets

The five are small and nearly indistinguishable mermaid girls, every one of them sporting curly shoulder-length hair atop a tail banded in white alongside a second shade. Cowboy hats, crop tops, and bubble rings that keep them aloft are common to all, and what sets them apart comes down to their color schemes and the patterns on their hats. Red hair, light green fins, a white top, and a green hat speckled white belong to Ichika, whose tail carries green stripes. Blonde-haired Nika pairs pink fins and a red top with a tail striped in red, her hat echoing that same striped design. Orange hair, light blue fins, a dark blue top, and a fully blue hat mark Sanka, whose tail bears blue stripes. Pink-haired Yonka shows yellow fins, a brown top, a plain white hat, and a tail striped brown. Rounding out the set, Yonka Two has brown hair, pale yellow fins, a black top, a jaguar-print hat, and a tail striped yellow.

A trademark back-and-forth ties the sisters together. Ichika leads with a flat observation, Nika echoes it as an eager shout, Sanka bluntly denies it, Yonka reshapes it into a question, and Yonka Two finishes by asking if it makes any difference. Apart from that habit they are warm, sociable, and seldom drift far from each other. As mermaids they are reportedly faster than fish of any sort, and Camie calls them swift swimmers who stay well-informed.

The quintuplets first appear inside Camie's house after Luffy and several crewmates spilled through Fish-Man Island's bubble, dropped into a current, and got separated. While Luffy, Sanji, Usopp, and Chopper reconnected with Camie, the sisters handed back their dried clothing, after which Camie made introductions and the whole party set off for Mermaid Cove. Later they told Camie that the royal gondola had arrived and asked whether royalty rode aboard, then turned uneasy when Fukaboshi rebuked the cove's mermaids for harboring pirates. They surfaced again at Coral Hill as royal guards started to suspect the Straw Hats of snatching mermaids, and disbelieved the report that the crew had taken Ryugu Palace. With the island's battle settled, they danced at the palace banquet and assembled to wave the Straw Hats off at the crew's departure.