Serilly, known as Seriri before the English reveal of Puyo Puyo Champions, is a mermaid that lives in a lake. She is a good friend of Owlbear, and is Suketoudara's love interest, although she is oblivious to his crush on her. Additionally, she has a shy and nervous disposition, stemming from belief in a legend that states that eating the flesh of a mermaid will grant one immortality.