Zastin is the captain of the Royal Guard of Planet Deviluke, a tall, striking man with distinguished silver hair, whose dedication to Lala Satalin Deviluke’s safety draws him to Earth and then into far more than he ever expected—including the life of a manga assistant.
Zastin stands at an imposing 205 cm tall and weighs 108 kg.
He has long, silver hair and sharp facial features, embodying the classic image of a gallant space knight.
His measurements are B125/W111/H116.
He possesses a commanding presence fit for his position as Guard Captain.
Zastin is the embodiment of chivalry: sincere, loyal, and polite to everyone he meets.
He takes his responsibilities extremely seriously, especially regarding the Deviluke Royal Family.
While he is courageous and reliable, he has a comical side as well, often missing the point in critical situations.
He is notably kind to women, reflecting his gentlemanly code of ethics.
Despite his impressive abilities, he tends to get lost and sometimes blunders in important moments.
Born on April 1, Zastin is an O-type blood holder.
He serves as the head of the Royal Guard on Planet Deviluke and is considered the strongest swordsman of the planet.
Originally sent to retrieve Lala Satalin Deviluke from Earth, he is swayed by Rito Yuki’s words and decides to aid in Lala’s protection.
Over time, his allegiance includes not just guarding Lala but also adapting to the peculiarities of life on Earth.
Zastin wields the “Imagine Sword,” a photon blade with immense cutting power—capable of splitting the ground, yet it won’t harm living bodies by accident.
He cannot cut through “dark matter,” rendering him powerless against certain substances.
His physical strength and combat skills surpass those of Nana and Momo, making him a formidable ally.
Despite his battle prowess, he is comedically ineffective when disoriented or distracted, and tends to self-sabotage.
Zastin respects and loyally serves the Deviluke Royal Family, especially Lala.
He acts as a guardian but also dishes out spending money to Lala and her sisters, always looking out for their well-being.
He holds lingering distrust towards Golden Darkness (Yami) and Kurosaki Mea due to their history as threats, maintaining a watchful distance.
He becomes an assistant to Rito Yuki’s father, Yūki Saibai, quickly excelling and eventually being promoted to chief assistant.
Unbeknownst to him, Tenjouin Saki admires him, but Zastin remains oblivious to her feelings.
He collaborates and crosses swords with individuals like Gid Lucione Deviluke and Kurosaki Mea, striving to protect those he cares about.
His hobbies include reading manga, drinking roasted green tea, soaking in hot springs, and eating fermented soybeans (natto).
He suffers from severe cedar pollen allergies.
Voice actor: Takehito Koyasu.
In the series’ first character poll, he ranked 11th with 447 votes.
He was originally conceived as a major rival character during planning stages, but became part of Lala’s group instead.
His manga submissions have made it to the finals of certain contests—a fact that once angered Gid Lucione Deviluke.
He often finds himself more dedicated to being a manga assistant than his original guard duties.
“I am Lala-sama’s loyal servant.”
“My blade serves to protect the Princess, and only the Princess.”
“A knight’s honor is found in loyalty and duty.”
Arrival on Earth
Zastin’s official duty begins when he travels to Earth to bring Lala Satalin Deviluke home.
After witnessing Rito Yuki’s determination, Zastin chooses to remain on Earth and protect Lala according to her wishes.
He adapts to Earth’s customs, even taking up work as a manga assistant alongside his own subordinates.
Guardian Life and Earthly Adaptation
Zastin continues to perform his security responsibilities, such as handing over space criminals to the Galactic Police.
He distributes monthly allowances to Lala and her sisters, becoming a familiar figure in their daily lives.
He continues to monitor the activities of potential threats like Golden Darkness and Kurosaki Mea, maintaining his guard.
At times, misunderstandings—particularly regarding his dedication to Lala—lead to awkward or humorous situations.
Manga Assistant and Rivalries
Zastin proves himself a superb manga assistant for Yūki Saibai and is trusted with crucial tasks, even handling the completion of manuscripts.
He aspires to debut professionally as a manga artist, and his work reaches the finals in a manga contest.
Despite these achievements, his divided priorities earn rebuke from his superior, Gid Lucione Deviluke.
He is drawn into new conflicts, particularly with the appearance of Nemesis and the threat she poses to Lala.
Darkness and New Challenges
In the sequel “Darkness,” Zastin’s protective instincts intensify as the threats to Lala grow more dangerous.
He confides in the group about the dangers posed by Nemesis, showing grave determination when Lala is harmed.
He expresses serious anger and a desire to retaliate against all who would target his Princess.
Zastin’s visual design was inspired by the character Creed Diskenth from Black Cat, with distinct differences in his voice casting.
He shares similarities with other loyal commanders and is voiced by an actor renowned for such roles.
He is sometimes paired with Tenjouin Saki in fan communities as “ZasuSaki.”
His love for manga and the arts has, over time, become as important to him as his original mission.
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