The final boss of Season 0. Long ago, he was sealed beneath an ancient tree after a battle with one of the three legendary heroes. However, as time passed, the sealing magic weakened, and he has finally awakened from his long slumber. His goal is to return to the Hell Kingdom he once ruled, reclaim his absolute power, and completely enslave the inhabitants of Hell. (Spoiler) He was actually a leader named "Ark" who ruled Hell as a benevolent king, doing everything he could for his people. However, he lost his mind due to the dark power of "Reminder" and became a complete demon. (Spoiler 2) He eventually meets his end by being completely annihilated through Deacon's sacrifice.

One of the heroes protecting the Spirit World alongside you and Rafe. He has been a hero slightly longer than you and Rafe, who have just finished your apprenticeship, and his combat power is truly worthy of the title. He has a wife named Anda and a son named Dia. He has asked that their soon-to-be-born baby be named "Dai." (Spoiler) However, he is destined to be sacrificed in the battle against Eternity, and he will ultimately die without ever seeing his second son's face.

Deacon's wife. She worries every day for Deacon, who leaves home to perform his duties as a hero, facing dangerous tasks and fighting perilous beings. She has a young son named Dia and is currently pregnant with their second child. According to Deacon, the baby will be named "Dai," and Anda seems to like the name as well. (Spoiler) However, after hearing the news that Deacon failed to return from the final battle against Eternity, she is left to raise both children alone while carrying a profound sense of loss.

Your fellow hero. A member of the Angel race and a long-time friend who has been by your side since your days as hero apprentices. Like you, he is a newly appointed hero who just finished his training, so he still tends to get flustered or make clumsy mistakes.