Rendered in the signature Q Posket style by Bandai Spirits, Eternal Sailor Neptune is captured with an air of quiet authority. The figure presents a graceful, slightly chibi silhouette characteristic of the line, yet her pose conveys readiness and regal poise. Her long aqua hair flows behind her in soft, sculpted waves, each strand catching light to create a sense of movement. She wears Eternal Sailor Neptune's navy-teal uniform: a crisp sailor collar, matching bow, and white gloves that reach past the elbows, accented by metallic touches at the tiara and brooch. Subtle shading along her flowing cape and pleated accents adds depth, while the sculpted base remains unobtrusive so Neptune appears to hover slightly above the surface. The overall finish is glossy yet refined, highlighting the colors and textures of the costume and giving a sense of ethereal, oceanic calm that defines the character.

In the Sailor Moon Cosmos storyline, Eternal Sailor Neptune stands among Earth's outer guardians, a strategist whose calm demeanor masks immense resolve. She and Sailor Uranus act as a united pair whose bond is built on trust, shared duty, and a belief in protecting both Earth and the wider cosmos. Neptune's powers, drawn from the sea, manifest as precise, cutting energy that can reveal truth and sever threats to innocent lives. In turning points across the film, she confronts darkness that seeks to erase futures, choosing mercy when possible and decisive action when needed. Her presence inspires other Sailor Guardians to stand firm, even when sacrifices seem great. Through battles that cross starfields and time itself, Eternal Sailor Neptune embodies elegance transformed into steadfast courage, offering hope that even in the most distant corners of the universe, guardianship and love can prevail. Her legacy is a testament to steadfast loyalty and protective grace.