The nation looks to be the most futuristic and advanced looking compared to the others. In terms of technology, Planeptune also looks to be the most advanced. It's filled with towering buildings and structures. The bottom of the landmass is also filled with buildings and skyscrapers.

In terms of appearance, most of its buildings are blue and white.

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Planeptune retains its appearance as a futuristic nation filled with towering skyscrapers and futuristic like building structures. It still looks to be the nation with the most advanced technology in all of Gamindustri. A noticeable structure on Planeptune is the Neptower, a large tower which is clearly visible within the city.
According to its history, Planeptune was on the verge of annihilation until Histoire and her comrades successfully prevented the crisis. Histoire would then save the nation again from its economical crisis. Due to her efforts, she was elected the head of state.

In terms of geography, Planeptune governs the western parts of Gamindustri. Its two surrounding cities are Erethisan City and Haneda City. Adding more credence to the fact that Planeptune is the nation most ravaged by monsters, its capital city is the nearest to the Gamindustri Graveyard .