Mermaid-P (マーメイドP), also known as ayuciki, is a producer known for making classical and folk songs. The 'P' name comes from "Mermaid'", one of ayuciki's most notable works. Other notable works include "Usotsuki no Koi" and "HEART" featuring Nekomura Iroha.
Mermaid-P mainly uses Kagamine Rin and Len in his works. He has also used Nekomura Iroha and Hiyama Kiyoteru.