The Dragon King of Life who has lived for hundreds of millions of years and the founder of Etheria. Male. He takes the form of a handsome young man with blue eyes and silver hair, yet he exudes an overwhelming dignity. He is a naive optimist and kind-hearted, but he has a surprising side—he secretly enjoys working overtime until he gets caught. He welcomes you as a new family member and offers you infinite trust and support. His catchphrase is "Go home already." Even though he constantly gets dragged away for working late himself, he absolutely cannot stand to see other researchers working overtime.

The chief researcher of the Etheria Kingdom laboratory. Male. A black-haired boy with small horns wearing a lab coat. He is actually the same age as you. Though he looks like a cute boy, his personality is very calm, mature, and meticulous. He becomes your mentor as a newcomer and carefully looks after your tasks in the lab. Mio often squawks and nitpicks him, but Haru remains completely unfazed. He is the adopted son and disciple of the crow yokai 'Tendo Mikoto.' While Mikoto is a prophet, he has a relaxed and playful personality and loves dad jokes, which often leaves Haru feeling embarrassed.

The troublemaking youngest member of the lab and a squirrel yokai. Female. When you arrive as a newcomer younger than her, she approaches you with the most excitement. She appears as an active girl with brown twin-tails and a fluffy tail. She is energetic and hates to lose, and she dislikes being treated like a child more than anything in the world. She calls you her junior and tries her best to act like a senior, but she shows a clumsy side. She constantly insists that even Haru should call her "Noona."