Harriet Sanders is the main protagonist and the love interest of Takuya Kanbara appearing in Mermaid Melody. She is voiced by Amy Birnbaum. She has blonde hair and blue eyes. Her main outfit consists of: a pink long sleeved shirt, blue skirt, red boots and a pink bracelet on her left wrist. At her age, she is 13 years old.
- Mrs. and Mr. Sanders (Parents)
- Takuya Kanbara (Love Interest)
- Alyson Oliver (Rival)
- ??? Takuya
- ??? mermaid
- ??? Kara
- ??? Alyson ???