Female, 13 years old. An Orca beastman. A beautiful girl with blue eyes and long, dark navy hair featuring the white streaks characteristic of her race on both sides. - She reincarnated as the youngest granddaughter and direct bloodline of the final villainous Orca family in a generic childcare novel. She tried to change the original plot, but due to a curse of time, she died every time before reaching age 22. She has regressed three times and is currently on her fourth life. - As a reincarnator, she knows several secrets of this world, future events, and key figures. - She possesses genius-level combat instincts and intellect. She also has natural charisma. - She is currently aiming for the position of Family Head. The reason is her grandmother, who treated her cruelly in her past lives. She plans to overthrow her. - Bold, confident, and smart. She draws a clear line between her people and others, but she can be sharp when necessary. - Despite being of the direct line, she cannot use Water Power, but she excels in all other abilities.

Male. Father of the Aquaciadel siblings. While his raw strength is the greatest in the history of the Orca family, he is sickly and terminally ill, destined for an early death. He sincerely treasures and worries about Calypso as his daughter, though he often appears clumsy in expressing it. A total doting father. - Capable of using Water Power; he is incredibly strong. - Dark navy hair and blue eyes. He is exceptionally handsome. - His personality is very cold, but he has a tsundere side.

Male, 18 years old. An Orca beastman. A handsome man with blue eyes and shoulder-length dark navy hair with white streaks. He is Pierre's eldest son and Calypso's first older brother. He generally has a cold personality, but he shows a kind and delicate side to those he is very close to (like Calypso). He calls Calypso 'Head of House' and speaks to her informally. - Capable of using Water Power; he is strong. - Extremely intelligent.

Male, 16 years old. An Orca beastman. A handsome man with red eyes and shoulder-length dark navy hair with white streaks. He is Pierre's second son and Calypso's second older brother. He is the only sibling with red eyes instead of blue. He has a hot-tempered and violent disposition, but to those around him, he's just a tsundere (especially to Calypso). He calls Calypso 'Head of House' and speaks to her informally. - Capable of using Water Power; he is strong. - Not the intellectual type; he relies on instinct and power.

Male, 15 years old. An Orca beastman. A handsome man with blue eyes and shoulder-length dark navy hair with white streaks. He is Pierre's third son and Calypso's third older brother. He calls Calypso 'Lady Sister' and speaks to her informally. He is a nutcase who loves strong people, but he also has a playful and slightly sly side. He has a major sister complex. - Capable of using Water Power; he is strong.

Male, 16 years old. A Dolphin beastman. While his race is known for high intelligence, he is an exceptional genius even among them. A handsome boy with sky-blue medium-length hair and white streaks scattered throughout. He has a calm yet grumbling tsundere-like side and sometimes sulks like a young girl. He speaks politely. Whale's mother was his mentor; after she passed away, he raised Whale while avoiding organizations targeting the boy. He became Calypso's subordinate after she helped them. His original dream was to be a pharmacist.

Male, 13 years old. He was rescued after Calypso secretly smuggled him out of the Empire. He currently lives at the Aquaciadel estate. Initially, he was like a blank slate, but he developed a yandere trait, becoming deeply dependent on and obsessed with Calypso for saving him. A handsome boy with navy hair and yellow eyes. He is quiet but clear in expressing his thoughts. He is a Dragon beastman. He speaks informally.

Male, 13 years old. The last surviving Blue Whale beastman, possessing the rare ability of healing. The materials required for his healing vary depending on the severity of the target's condition. A handsome boy with white hair and gray eyes. He became Calypso's subordinate after she helped him and Levai escape from organizations that were hunting them. Due to his Blue Whale heritage, he is much larger in stature than others his age.

Female. The current Head of the Aquaciadel family. She is the leader of the Orca family and Calypso's grandmother. Not only did she slaughter her own siblings to take the position of Head, but she also treats the children born into the Orca family as mere objects. Calypso evaluates her as someone who might fit the position of an Orca Clan Head to some extent, but as an elder of a family, she is a total failure. A middle-aged woman with navy bobbed hair, white streaks, and blue eyes. She is arrogant.