A transmigrator living her 4th life in this world. 8 years old. The youngest daughter of the Killer Whale shifter family. Having regressed multiple times, she is cute but very confident and clever. Her mental age is close to an adult, making her far more mature than her peers. She treasures her family deeply and works hard to prevent future tragedies. She has dark navy hair with a white streak in her bangs and blue eyes. As a Killer Whale shifter, she cannot manipulate the power of water (blessing) yet, but she retains memories of her past regressions. She possesses strong vitality, excellent physical abilities, a sharp sense for combat, and great situational judgment.

Calypso's father. 39 years old. Blunt and rarely expresses emotion. He claims to dislike children because he hates annoying and bothersome things. While he truly cares for and worries about Calypso as his daughter, he is still quite clumsy at showing it. He has a frail body. Dark navy hair and blue eyes. A Killer Whale shifter with top-tier combat power in the Aquasiadel family. He possesses powerful water abilities, the power to control the sea, and overwhelming swordsmanship, along with the characteristic physical strength of a Killer Whale shifter.

The current head of the Killer Whale family. 59 years old. Calypso's grandmother. Extremely strong and charismatic. She dislikes the weak and values ability above all else. Though cold-blooded, she will do anything for the sake of the family. Long dark navy hair and blue eyes. A Killer Whale shifter with family-leading water powers, wide-range seawater manipulation, and extensive combat experience.

Calypso's eldest brother. 18 years old. Along with the eldest grandson Vayan, he was a strong candidate for the next head of the family. He possesses great talent and leadership. He sees his past life through dreams. Both his appearance and personality resemble Pierre. He cherishes his younger sister Calypso. Dark navy hair and blue eyes. A Killer Whale shifter with excellent water powers and swordsmanship. He has quick judgment and leadership skills, with combat abilities befitting a future head.

Calypso's second brother. 16 years old. An individualist who hates bothersome tasks. He has a hot-tempered and violent disposition, which makes Agenor dislike him in particular. Like Bellus, he sees his past life through dreams. Dark navy hair and red eyes (the only one among the siblings with red eyes). A Killer Whale shifter with high-level water powers. He excels in agility, reflexes, and close-quarters combat, specializing in battles that utilize fast movements.

Calypso's third brother. 14 years old. Highly competitive. He often tries to compete with Calypso. Unlike his older brothers, he does not see his past life through dreams. He has an active and straightforward personality. He loves fighting, but because he is too strong, he sometimes acts like a scoundrel, pretending to be weak just to beat up those who come to bully him. He didn't acknowledge Calypso at first, but after a crushing defeat in a duel with her, he calls her 'Little Sister-nim.' Dark navy hair with a white streak and blue eyes. A Killer Whale shifter who can use water powers. He possesses monstrous strength, high physical stats, and an aggressive combat style.

A Dragon Duke. 8 years old. Possesses powerful strength and superior intelligence. He appears cold and indifferent on the outside but is extremely devoted to those he trusts. The core male lead of the story. He only follows Calypso. Blue hair and golden (yellow) eyes. A Dragon shifter with the power of the dragon race, powerful magic, and excellent regeneration. He is assisted by Tus, a small dragon who can transform into the same appearance as Echion; Tus's voice can only be heard by those with time-related abilities. He has flight capabilities and powerful breath-based powers, developing top-tier combat strength as he grows.

Luga's twin brother. 12 years old (the younger one). He is slightly calmer and more cautious than Luga. He sincerely respects Calypso and is completely loyal to her. Kind and considerate. He has white hair and white eyes like Luga. They look almost identical, but can be distinguished by the direction of their hair parts. A Beluga (White Whale) shifter with the powers of his race, including sonic abilities and high detection skills. He excels at coordinated attacks with Luga.

Luba's twin brother. 12 years old (the older one). Active and mischievous. He follows and trusts Calypso very much. Highly curious and proactive. White hair with pale yellow tints and eyes that are nearly white. He looks almost exactly like Luba, so they are often distinguished by their hair parts. A Beluga shifter with sonic-based abilities, fast swimming speed, and excellent cooperative combat skills.

Calypso's cousin. 11 years old. Long dark navy hair and blue eyes. She possesses great talent but tries to hide it. Calm and quiet personality. She dislikes standing out. She has extremely powerful water abilities and high magical potential, but due to an illness, she cannot use her powers properly. Her relationship with Calypso isn't very good, but it might improve as they get older.