Seika Lamprogue

A Yin Yang master and the third son from the noble Lamprogue family of the Uldewight Empire. He is a boy with the rare domestic traits of black hair and black eyes, and refers to himself as "boku". He is a student at the Imperial Rodnea Magic Academy.

In his previous life, he was known as Haruyoshi Kuga (His voice - Yuichiro Umehara), famous as the strongest Yin Yang master of his generation. However, he was not savvy with strategies, which led to his downfall as he got caught in the succession dispute of the imperial court and was ultimately killed by a female disciple of his.

Seika theorizes that his soul reincarnated in another world because there wasn't a suitable body for his soul to reincarnate in his original world. Count Blaze Lamprogue is not his biological father; Seika was given to the estate by a mysterious woman as the son of Blaze's brother Gilbert, who disappeared in the demon clan's territory (he is publicly referred to as a child of a concubine). From before he could even speak, he was feared by his stepmother as a part of the demon clan and ostracized/rejected by his brothers due to wrecking objects and living creatures using magic (his brothers were too young to remember why). At age three, when the magic power measurement declared him as "no magic power," Haruyoshi's will and memories awakened, and he ceased his destructive behavior. Seika believes that being a child of a concubine and having no magical powers are the reasons why his family and servants detest him, as he has no memory from before this time in this world. Although he cannot see them, spirits do not approach Seika.

Instead of magical power, he possesses a curse power similar to his previous life, which allowed him to arrange Onmyodo into something resembling magic, entirely changing his reputation. After defeating a monster that attacked the estate, he was recognized by his father Blaze and enrolled in the magic academy. Seika gets terribly motion sick in carriages.

At first glance, he appears cool and aloof, but he actually has the power to easily destroy a country yet cannot live in solitude. He has a deep empathy and cannot overlook a crisis befalling someone close to him, even if it means his own destruction. This was one of the reasons for his demise in his previous life, and although he vowed to change after reincarnating, his emotional responses remain unchanged from his past life. In his previous life, having raised many orphans as his disciples over a long lifespan, he treats his peers like Yifa, Amyu, and Maybell of the same age in this life with a guardian perspective, unaware that they may have affectionate feelings towards him as a man.