Characters who play a part in the plot of the game, but do not have their own dedicated profiles in the official guide.

Captain

Written as 隊長, taichou. His personal pronoun is Boku (僕). The core of the World of Idols. First introduced to Cai and Bel as a simple information dealer, telling them what they want to know. As they view Mimimi’s memories at his request, they become aware of his status as someone who knows more about Mimimi than he lets on. He was Mimimi’s first fan, enchanted by the sincerity in her singing, but grew disillusioned with her following the creation of her character on stage, seeing her as a fake idol. He tries to kill her, causing her to develop abilities, and she ends up being sent to Paradise.

Trainer

Written as 教育者, kyouikusha. His personal pronoun is Watashi (私). The core of the World of Siblings. A man who made Rimm, Wil, and the other children's lives hell at the facility. He deeply believes that his actions, in making children murder his enemies, will lead to a peaceful utopia, and he sees himself akin to Rimm in this sense, as they both have a similar goal.

Diantha

Written as ディアンサ, diansa. Her personal pronoun is Watashi (私). The core of the World of Religion. The determined leader of the resistance that opposes the church in the World of Religion. She goes by An (アン) in the slums. She is sharp-tongued and determined, but not unkind. While who Temple was in the past was extremely dear to her, for the sake of everyone who has suffered at his hands, she is willing to personally take him down and work to destroy his world.

Aoi

Written as アオイ, aoi. A retired idol who lives in the World of Idols. Cai and Bel were sent to find her when a concerned fan mentioned she had disappeared. She had been forced into living in the red-light district by Mimimi due to her popularity. She works in a cabaret club, hiding her previous identity, and she tells the brothers to tell her fan she is dead.

Jeky and Hy

Two brothers who live in the World of Siblings. Jeky (written as ジキ, jiki) is the older brother, someone who healed others in the town before falling ill himself and becoming a shadow. Hy (written as ハイ, hai) is the younger brother who worries about his older brother dying and goes to get medicine for him alone. Their names are derived from Jekyll and Hyde (ジキルとハイド).

God's Older Brother

A glowing red orb who comes to consciousness a split second before God does. They are curious and interested in living beings, willing to give up their individuality to help them. They help defeat God, sealing them in the form of a meteorite. As part of the universe, they have been watching over their younger brother, and in the secret end it is revealed that they were behind Monkey Submarine’s strange abilities. They use Watashi (私) as their personal pronoun in contrast God’s more arrogant Ware (我).

Unknown God

A glowing white orb who comes to meet with God and their older brother. They seem annoyed with the two for unknowingly abandoning their duties and letting things go stagnant in the universe. Seeing as they can so easily tell God and their older brother to give up their senses of self, it may be that they are of a higher rank in the deity hierarchy.