Tarou Mitsuki

He was the music teacher at Luchia, Hanon, and Rina's school. He once had a relationship with Sara years ago but he left, Sara thought he broke up with her, causing her to turn from a orange mermaid to a black mermaid. because of the hate she had towards him. Later on Tarou revealed why he left Sara, because she was the orange pearl princess and had alot of responsiblities. She forgave him, butdied with Gaito in the end. Hanon had a huge crush on him ever since she saw him, when he left the country after Sara perished she confessed and he kissed her on the cheek and gave her the song sheet that he wrote for her.