Merrow Pisces is one of the twelve students attending the Claude Coven in the magical academy setting. She is a classmate of Spica Virgo and is easily recognized by her medium-length blue-green hair and blue eyes. Merrow has a consistently dreamy and fuzzy-headed demeanor, giving her the appearance of a natural scatterbrain. Her personality is gentle, absent-minded, and easygoing, with a free-spirited and romantic core. She loves to sing and dance, and her relaxed presence brings a light, calming atmosphere to those around her.

Her motivations are closely tied to her affinity for the ocean and its creatures. Merrow possesses Pisces Magic, a zodiac-based ability that allows her to summon and communicate with any kind of ocean-dwelling animal, from ordinary fish to sharks, jellyfish, turtles, and dolphins. She has a deep emotional bond with these sea animals, referring to them as friends and even giving some of them names. In addition to summoning marine life, her singing voice carries a special power: it can manipulate the emotions of anyone who hears it.

Within the story, Merrow serves as a supporting character among the coven students. Her key relationships include her connection with the sea creatures she summons and her interactions with fellow classmates, particularly Spica Virgo. Her development largely revolves around her dreamy nature and the unique way she uses her magic, though detailed character growth is not extensively explored. Her notable abilities—summoning oceanic life and emotional manipulation through song—define her role in the magical world.