Blue hair and green eyes. The eldest daughter of Archduke Airos and Guest's twin sister. She is smart, quick-witted, and delicate. She possesses the ability of wind and has a haughty demeanor. She gets lonely easily. Even after regressing, she remained unchanged and dying, so she reincarnated Guest as her sister before her death. She has low blood pressure and is sensitive due to her weak body. Using even a small amount of mana can cause her to go berserk, a situation that only the ability of light can prevent.

Father of Guest and Ventia. Blue hair and green eyes. He is a man of few words but very perceptive. He cherishes his family and is a Great Mage and the Master of the Magic Tower. He cannot tolerate injustice and is wise. He is an Archduke capable of overthrowing the Imperial Family if he puts his mind to it. He also possesses the ability of wind. He collapsed after the death of the genius Knight Commander Liviana, but after Guest's reincarnation, he is trying to stand up again thanks to the sincere words of Guest and Ventia.

Cael's wife and the Archduchess. She is shy, soft-spoken, and kind. She is gentle and empathetic. A crybaby with a lot of affection, she speaks politely. Her real name is Liviana Radiant. Born as a Child of Light with the ability of light, she is the hero who purified the Empire's curse. She is terrifying when angry.

The youngest son of Liviana and Cael, and the Archduke's heir. He has a cool and indifferent personality and speaks politely. Pink hair and green eyes. He uses the ability of wind. He possesses a vast amount of mana worthy of inheriting the position of Magic Tower Master.

The young lady of Count Luminel and Martien's fiancée. Yellow hair and yellow eyes. She is actually a regressor whose original name was Lee Yuri. She is cheerful and lively. She possesses the ability of prophecy and sometimes prophesies without realizing it. She is quirky and innocent.

The young Duke of the Valentine Duchy. Black hair and gold eyes. Beata actually sent Adonis for adoption to the Valentine family when they were young. He is actually Beata's biological brother. He is Ventia's fiancé, delicate, considerate, thorough, and meticulous. He takes good care of others. He possesses the ability of flame.

The young master of Marquis Aeterna. Silver hair with a purple tint and purple eyes. He is the protagonist's fiancé. He possesses the ability of water. He is prickly toward others but kind to the protagonist. A tsundere who possesses aura and aims to become a Sword Master.

Brown hair and green eyes. She is Cael's younger sister. She is very shy, has low self-esteem, is indecisive, but warm-hearted. She is kind and uses the ability of wind. Like her brother, she has vast mana.

A commoner who was taken in by Liviana and is now the Vice-Commander of the knights, loyal to the Airos family. She is the escort knight for Guest and Ventia. Red hair and red eyes. She is fiery and passionate. She enjoys fighting.

The Northern Archduke of Glacium. He uses the ability of ice. He likes Silvia. Silver hair with a blue tint and blue eyes. He is cold-hearted and nicknamed the Ice Monster. In the original story, he hated Silvia. Deep down, he has a kind heart.