Mel Yumegatari is a shy individual with a deep love for fairy tales. Physically distinctive, she has a short stature, waist-length light pink curly hair, and bright green eyes. Her candy-themed attire consistently includes a cotton candy bonnet hat, a white dress layered over a blue jumpsuit, and a peach and red bow. She wears sky blue and light red socks with light red and white shoes.

She harbors intense romantic feelings for Subaru Hoshiyomi, seeing him as her prince. This admiration causes nervousness and difficulty speaking to him directly. Her buddy monster, Red Riding Hood Emma, complements her fairy tale persona.

Key events include her participation in a Buddyfight to break Subaru’s curse in episode 7 ("Mel's Adventures in Fairyland! Reverse Subaru's Curse!"), showcasing her resolve despite timidity when others are at stake. Her official Buddyfight record notes a loss against Subaru in episode A7 and a victory against Dan Yamada in "Buddyfight Legends 'Wonderland Walker, Alice'".

Ancillary media documents a prank call where she vehemently denies romantic interest in Yuga Mikado, insisting on exclusive affection for Subaru. She displays strong emotional distress when teased about potential multiple romantic interests.