One Piece Encyclopedia

Medaka Mermaid Quintuplets

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For the girl from the first OVA, see Medaka.

Medaka Mermaid Quintuplets
Manga - Anime

Medaka Mermaid Quintuplets Anime Infobox

Japanese Name: イチカ, ニカ, サンカ, ヨンカ, ヨンカツー
Romanized Name: Ichika, Nika, Sanka, Yonka, Yonka Tsū
Official English Name: Ichika, Nika, Sanka, Yonka, Yonka Two
Debut: Chapter 608; Episode 527[1]
Affiliations: Neutral
Status: Alive
Japanese VA: Masami Suzuki

The Medaka Mermaid Quintuplets are five tiny young mermaids who are friends with Keimi. Their names are Ichika, Nika, Sanka, Yonka, and Yonka Two.


Keimi Anime Post Timeskip Infobox

The Quintuplets' size in comparison to Keimi.

The Medaka Mermaid Quintuplets are five tiny identical-looking mermaids. They all have curly hair and tails with white stripes. They also all wear cowboy hats, crop-tops, and bubble swim rings. The bubble rings apparently allow them to fly in mid-air. They are physically identical except for their colors and the designs of their hats.

Ichika is a redhead with a green-striped tail, her top is white and her hat is green with white polka-dots.

Nika is blond with a red-striped tail, her top is red and her hat matches her tail.

Sanka has orange hair and a blue striped tail, both her top and hat are solid blue.

Yonka has pink hair and a brown-striped tail, her top is brown and her hat is white.

Yonka Two has dark brown hair and a yellow-striped tail, her top is black and her hat has jaguar-prints.


The five sisters tend to talk in a unique speech pattern. Ichika starts off first by saying a regular statement. Nika then states an exclamatory version of Ichika's statement. Sanka then states the opposite of the original statement. Yonka then questions the original statement. Lastly, Yonka Two then questions whether the original statement matters or not. An example of a typical routine:

Ichika: Luffy is a pirate.
Nika: Luffy is a pirate!
Sanka: Luffy is not a pirate.
Yonka: Luffy might be a pirate.
Yonka Two: So what if Luffy's a pirate?

Other than that, they are cheerful, friendly and they usually stay close together.

Abilities and PowersEdit

As mermaids, they are the fastest type of fish.


They are first seen in Keimi's house when Luffy awakens after he and his crew flew through the bubble surrounding Fishman Island, fell into a current, and got separated. As Luffy, Sanji, Usopp, and Chopper get reacquainted with Keimi, the quintuplets give them their dried clothes. They are next seen in the Mermaid Cove, telling Keimi about the arrival of the royal gondola, and whether or not royalty was on board. They are then seen in Coral Hill when the residents start suspecting the Straw Hats for kidnapping mermaids. Later on, they hear the news of the Straw Hats "taking over" the Ryugu Palace.

After the battle for Fishman Island, the quintuplets are seen dancing at the banquet in the Ryugu Palace. When the Straw Hats finally leave Fishman Island, the quintuplets are there to bid them farewell.

Translation and Dub IssuesEdit

The quintuplets names are based on Japanese numbers. Ichika comes from Ichi meaning 1. Nika comes from Ni meaning 2. Sanka comes from San meaning 3. Lastly, Yonka comes from Yon meaning 4. The last sister's name, Yonka Two is just as is. This forms a joke as based on the first four sisters' names, there is a numerical pattern. Based on the pattern, Yonka Two's name would naturally be expected to be Goka from "Go" meaning "5", as Usopp points out at their introduction. Instead however, her name breaks the pattern.


  1. One Piece Manga and Anime — Vol. 62 Chapter 608 and Episode 527, Keimi introduces the Medaka Mermaid Quintuplets to the Straw Hats.

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