The Landlord is an elderly man appearing in 'The Bathhouse RE'. He is the manager of the apartment where Elena lives and is also involved with the bathhouse. In the beginning, he appears to be an ordinary old man teaching the ropes, but he is actually the person responsible for the tragedy that drives the story. In the past, he became obsessed with Sakurako, who worked at the bathhouse, and confined her in the basement. Sakurako gave birth to twins there but lost her life. The twins were rescued by the Priest and named Elena and Tohru. Afterward, Sakurako became the yokai Ubume and haunted the Landlord. To exorcise the Ubume, the Landlord attempts to use Sakurako's daughter, Elena. He relentlessly pursues Elena in the final stages of the story, but in the True Ending, he is defeated in a confrontation with the Priest.

Tohru is a young man appearing in 'The Bathhouse RE' and is the twin brother of the protagonist, Elena. He lost his mother, Sakurako, at a young age and was protected by the Priest. He is a key figure deeply connected to Elena's birth and the secrets hidden within the bathhouse. Initially, his identity is not revealed in detail, but as the story progresses, it is discovered that he is Elena's biological brother. He gets caught up in the incidents involving the Landlord and the Ubume and acts to save Elena. In Ending 2, he meets a tragic fate by sacrificing himself to save Elena. On the other hand, in the True Ending, he succeeds in helping Sakurako's soul find peace and begins a new life with Elena.

The Priest is a Shinto official at the shrine appearing in 'The Bathhouse RE' and is a person who knows the important truths of the story. He was involved in the past incident between Sakurako and the Landlord and knows the detailed circumstances of Elena and Tohru's birth. When Sakurako was confined in the basement by the Landlord and lost her life after giving birth to twins, the Priest protected the newborn children. He gave them the names Elena and Tohru and placed them in an orphanage. In the middle of the story, he gives Elena an amulet and explains the past hidden in the bathhouse and the existence of the Ubume. In the final stages, he confronts the Landlord and emerges victorious in the True Ending. Afterward, he reflects on his own past and regrets his previous actions. He is a vital character who saves Elena and Tohru and brings closure to the tragedy surrounding Sakurako.

Sakurako is a woman appearing in 'The Bathhouse RE' and is the biological mother of Elena and Tohru. She once worked at the bathhouse but was subjected to the Landlord's abnormal obsession and confined in the basement. Pregnant with twins at the time, Sakurako gave birth to Elena and Tohru in the basement. However, she lost her life shortly after. After her death, Sakurako became the yokai 'Ubume', continuing to exist as a supernatural entity due to her strong lingering attachment to her children. She also haunts the Landlord and is deeply connected to all the hauntings in the story. In the True Ending, Elena hands two umbilical cords to Sakurako, which clears her regrets as a mother and allows her soul to finally pass on. Despite being a terrifying apparition, her true identity is that of a sorrowful mother who never stopped thinking of her children.