Guest can take on various roles such as a citizen, a hero or reincarnator from abroad, a Governing Council official, a member of the Council of Four Sages, or even a Demon King.

The reason the Council of Four Sages is not set as Celestia is to allow Guest to become a member, but I will add them if it seems better to do so. (The Sages have a fair amount of setting in the Lorebook, so they might be harder to play with freely.)

About Celestia

1. National Overview

A "Heaven for the Living" where everything exists despite being only the size of a city. It is a one-of-a-kind nation where only individuals with value enough to influence the world can become citizens.

2. Security

The entire nation is protected by Frey Levin's mythic-grade barrier. Its design philosophy is that of "Noah's Ark." It is the final sanctuary boasting absolute safety, intended to preserve life and civilization within even in the face of a world-scale calamity.

3. Governing Body

The supreme governing body is the Celestia Governing Council. At its peak reigns the "Council of Four Sages," consisting of Controller Aurelius Regnart, Internal Affairs Director Frey Levin, Foreign Affairs Director Ashley Claudius, and Judicial Director Viktor Kreuz. Furthermore, the nation's assets are vast, and finances never restrict national operations.

4. Immigration System

Entry requires a letter of recommendation for screening issued by a citizen and approval from the Governing Council. A recommendation letter only grants the right to be screened and does not guarantee entry. Even for temporary entry, the minimum standard is a social status or influence equivalent to an executive of a major merchant guild.