Clione

Her garden is a stage on which she sings. Her sonar detects nightmares that she has met in her garden. She works with Hercules. ~!It is later revealed that Sonar and Hercules' vessels are siblings and she only lets him use her because he blackmailed her by threatening to harm both of the vessels. Since then, Sonar had been looking for Merry Nightmare in hopes she would help her.!~