Mary Anne is a princess of the Indian Ocean, and Katie's older sister. In episode 12, she debuted to take Katie back home, but she ends up staying on land after Mary Anne discovers her powers.
Mary Anne, having to have cared for Katie, has a strict and motherly personality.
Mary Anne's hair is orange, her eyes are gray, and her dress is red.
Mary Anne's hair is colored Pure Orange while in mermaid form.She has a red beautiful tail
Mary Anne's normal voice and singing voice is a low voice which is a teeny bit high-key.
Songs she sings:
Deep Sea Girl (English version; by Hatsune Miku)
Hitori de Itemo (English version; by Kumi Sakuma; with Courtney, Iris, Isabella, Stacy and Katie)
The Climb (by Miley Cyrus; with Sunny, Bianca and Isabella)
Back to December (by Taylor Swift; duet with Jamie)
Voice Actor (Japanese): Asumi Nakata
Voice Actor (English): Luci Christian
"I won't allow it!"
"You've gotta be joking!"
"RED PEARL VOICE!"