Sanka

サンカ

The Medaka Mermaid Quintuplets (Medaka no Ningyo no Itsutsu-go) are five small young mermaids who are friends with Keimi. Their names are Ichika, Nika, Sanka, Yonka, and Yonka Two.
Sanka has orange hair and a blue striped tail, and both her top and hat are solid blue.
The five sisters tend to speak in a unique pattern. Ichika begins by making a regular statement. Nika then repeats it as an exclamation. Sanka states the opposite of the original claim. Yonka questions the original statement. Finally, Yonka Two questions whether the original statement matters. An example of a typical routine:
-Ichika: Luffy is a pirate.
-Nika: Luffy is a pirate!
-Sanka: Luffy isn't a pirate.
-Yonka: Luffy might be a pirate.
-Yonka Two: So what if Luffy's a pirate?
Apart from that, they are cheerful and friendly, and they usually stay close together.
First Appearance: Chapter 608; Episode 527