Fish Eye serves the Dead Moon Circus under Zirconia and Queen Nehelenia as part of the Amazon Trio. Originally a circus fish, VesVes and PallaPalla of the Amazoness Quartet transformed the character into a humanoid using an Amazon Stone. The name references the mineral apophyllite, called "gyoganseki" (fisheye stone) in Japanese. The civilian alias Nanami Uokawa translates to "seven seas" and "fish river." Presenting as an androgynous male, Fish Eye possesses a feminine face and slender physique. Distinctive features include long blue hair in a loose ponytail secured by a red bobble, turquoise-tipped strands, elf-like ears, a forehead stone, and two colored streaks on the left cheek. The character wears a light blue puffy jumpsuit with a deep V-cut and a pink fish skeleton imprint, light blue high-heeled boots featuring neon-pink accents, and dangling orange-and-green earrings. The hands are webbed and scaly with pink-painted nails. In animal form, Fish Eye resembles a light blue lionfish with green stripes and polka-dotted fins. Powers encompass water manipulation, teleportation through water hoops, summoning male Lemures to inflict nightmares, and trapping victims within mirrors. Combat employs throwing knives, swords, and nets, alongside a water-based beam capable of rendering targets unconscious. Within the anime narrative, Fish Eye exclusively pursues attractive men, frequently utilizing crossdressing disguises to entice heterosexual victims. The character develops genuine affection for targets, differing from Tiger's Eye and Hawk's Eye's approaches. A significant arc involves falling for Mamoru Chiba, culminating in a kiss and internal conflict regarding the trio's humanity. Following Mamoru's rejection, Fish Eye bonds with Usagi Tsukino, deducing her identity as Sailor Moon and Chibiusa's link to Pegasus. This loyalty shift leads to sacrificing the Amazon Stone to restore Usagi's dream mirror and dying alongside Tiger's Eye to protect her from Zirconia's assassin. Pegasus later revives the trio as fully human with dream mirrors. In the manga, Fish Eye plays a minor antagonistic role. Disguised as a fish sold to Ami Mizuno, the character exploits her vulnerability over her absent father, luring her into a nightmare of familial rejection. After Ami breaks free as Super Sailor Mercury and destroys the Lemures, Fish Eye is defeated by Sailor Moon and Sailor Chibi Moon's Moon Gorgeous Meditation. Within *Sailor Moon Eternal*, Fish Eye operates a tropical fish store, targets Ami Mizuno, and traps her in a mirror-induced nightmare concerning maternal abandonment. Super Sailor Mercury escapes using Mercury Aqua Rhapsody, and Fish Eye is defeated by Sailor Moon and Sailor Chibi Moon. Supplementary materials identify the character's dream as becoming a "famous ball balancer."