Undine functions as a supporting elemental entity embodying the Aqua Element. Her light green hair features teal highlights and is styled in two thick braids alongside smaller side braids, with a fringe parted to the left that curls upward at its tip. She possesses sharp blue eyes, deep blue lipstick, and sky blue eye shadow. Categorized among elemental beings, she belongs to the broader grouping of elemental characters within her universe. Her narrative debut occurs in Episode 15, "No More! I Just Can't Handle Training Camp!". The name Undine derives from the Latin "unda," meaning "wave," aligning with mythological Undines—female water elementals or nymphs depicted as water spirits in folklore.