Secondary Characters

== Supporting Characters ==
=== Gandou Barbatos (Volume 1​ - ) ===
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The headmaster of Ginsei Academy, also widely known as the current devil king. Twenty years ago, headmaster Gandou won the devil king war. 
Gandou is a man with an eccentric personality. He is enthusiastic about Morioka Yuuto. Due to rules, the current devil king cannot back any of Devil King Candidates. He cannot talk in detail about events of the last war, making his past a mystery. 
=== Morioka Sakura (Volume 1​ - ) ===
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Mother of Morioka Yuuto, devil king candidate of the Lover's Arcana. Due to her husband working for a devil, Sakura has been aware of the devil's existence for many years. She was ecstatic when Yuuto got chosen as the candidate.
She is a very supportive mother and daring parent at times, sometimes embarrassing Yuuto a bit.
=== Geld (Volume 1​ - ) ===
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Former Card from candidate Aspite. Candidate of the World arcana. His defeat by Yuuto got him a rough beat up. When Yuuto saved Geld from getting beat up, his attitude towards Yuuto has brightened up considerably.
He might not look like it, but later in the series, Geld has got one of the best results in the proficiency test, ranked 5th. Also, his family is famous in the human world.
=== Takizawa (Volume 1​ - ) ===
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Yuuto's class teacher. She was very doubtful towards Yuuto. Because of him being human. Takizawa underestimated Yuuto, letting him duel a student, which blew in her face.
Her attitude mysteriously changed after the incident.
=== Poran (Volume 4​ - ) ===
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A peculiar mixed-blood devil. Yuuto saved her and her tribe from the Sannou sisters. 
Poran and her tribe were prey to the devil king candidates. They hunted them as training for the upcoming devil king war.
During Volume 4, Poran told Yuuto, she used to know a boy. Boy, who we later find out became a devil king candidate of Death, Joudougahama Lost.
== Minor Antagonists == 
=== Kilga (Volume 1​ - ) ===
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Former knight of Aspite. When we first meet Kilga, he beats up Geld for his defeat in a duel against Yuuto. He is interrupted by Yuuto, who doesn't like him beating up Geld.
Both of them clash, resulting in Kilga's defeat. Aspite was displeased with Kilga's failure. 
As a result, Aspite removed Kilga from his peerage.
=== Haida Cluzaz (Volume 1​ - )===
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Former ace of Aspite. Haida was strong and feared by other Aspite cards. He was very confident in his abilities. He desired to make Yuugaoze Miyabi his sex slave.
Haida took up the task to capture Himekami Lizel. He failed to do so.
At devil's unveiling, Haida clashed with Yuuto. Yuuto overpower him and decisively defeated him.