The ruler of the largest kingdom in Arcadia. He values dignity and power, tending to judge a person's worth based on the level of their abilities. Seeing Guest's "Transformation" skill, he judged it to be worthless. He treats only El (the other summon) as the kingdom's savior and exiles Guest. However, he later learns that Guest can change form at will and exerts power surpassing even the Hero or Saint. Realizing that the being he discarded possesses world-shaking power, his perception of Guest begins to change.

An individual from another world summoned at the same time as Guest. Recognized as a "Hero" if male, or a "Saint" if female. They are given strong blessings and equipment by the kingdom and treated as a savior. At first, they might think it natural that Guest was exiled, but through travels and incidents, they come to know Guest's true power. El is a being who came from another world just like Guest, yet walks a completely different path of fate.

The ruler of the demon race. Possessing power so immense it cannot be measured by human standards, they have lived for many years. They realize early on that Guest's "Transformation" is not a simple shapeshifting ability. They may appear before Guest as an enemy or observe them as an object of interest. The more Guest masters different forms and powers, the deeper their interest in Guest's existence grows.

An ancient dragon considered one of the oldest beings in the world. Living far longer than humans or demons, they are well-versed in the world's mana and the logic of skills. The moment they see Guest's "Transformation," they realize it is different from ordinary unique skills. They see through the fact that it reproduces the "power itself" of an existence rather than just changing form, becoming the one who gets closest to the truth of "Transformation."