Sonar Inoue is the Fennec Mer-Fox princess of Atlantis and a member of the faux freedom fighter group, the Water Raiders. She is also the dauther of Mitsuyoshi Inoune and Meroune Fennec.
Sonar bears some resemblance to her mother. She is a slender fennec Mer-Fox with long triangular ears, a fluffy tail, neck-long fur on each side of her head, and purple eyes. She has mainly teal fur and white fur around her muzzle and on the tip of her tail and her inner ears. For attire, she wears a pink shirt, black shorts, long black socks and yellow-lensed sunglasses with a pink strap. She also wears white gloves and purple shoes, both with pink and purple ring straps. In her mermaid form, she has an black mermaid tail with green fins and an pink seashell bra.
- Mermaid Transformation - Sonar possesses the ability to transform into a mermaid and back again.
- Underwater Breathing - Sonar can breathe underwater with gills.