Coral is a mermaid from a book My Best Friend is Ariel.
Coral is member of Sebastian's band for Triton's birthday. She plays cymbals, but kept missing her cues and dropping them. Sebastian stormed out and ended the rehearsal. Ariel tied to cheer up Coral by bringing her to her secret grotto. After Ariel hears her sing, she suggests that Coral sing instead of playing cymbals, and the concert is a success.