Barbatos is Zagan's longtime best friend, known for his amazing magic skills and the nickname "Purgatory." He often looks tired because he uses magic to avoid sleeping, which makes dark circles appear under his eyes. He is a former candidate for Demon Lord, and at one point he tried to harm Zagan out of jealousy and ambition, but after his defeat, he became Zagan's trusted companion, now getting stuck helping with everyday problems.
Barbatos always has noticeable dark circles under his eyes because he uses magic to control his adrenaline instead of sleeping. This gives him a tired look most of the time.
Barbatos is sharp, sarcastic, and a bit self-centered. He often makes snarky comments, especially toward his friends. Still, he is loyal and responsible, especially after he gives up his rivalry. Even if he complains, he helps his friends and keeps his promises.
Barbatos was once a student of Andras, a magician known as "Resentment," who kidnapped Zagan in the past and was killed by him. Barbatos thought all of Andras' knowledge, castle, and wealth should belong to him, but Zagan took them. This made Barbatos hold a grudge against Zagan. He also wanted to prove himself strong enough to become a Demon Lord.
Barbatos is a powerful magician, known by the name "Purgatory." His skill with magic is exceptional, and he can even use magic to control his own body's energy and avoid sleep.
Barbatos is Zagan's oldest and closest friend, even though they were once rivals. He also interacts with Chastille Lillqvist, becoming her keeper and protector after Zagan asks him for help. Barbatos had a grudge against Zagan but eventually lets it go and becomes his loyal companion.
Working with Other Magicians
Barbatos wasn't happy that Zagan ended up with all of Andras' knowledge and wealth. He needed to prove his power and wanted to become Demon Lord. So, he teamed up with magicians like "Face Snatcher" and others, repeatedly kidnapping girls as sacrifices. He used Zagan's name to frame him, all as a setup for summoning a demon.
Kidnapping Nephelia and Chastille
When Barbatos visited Zagan, he quickly noticed that Zagan liked Nephelia. To annoy Zagan and to use them as sacrifices, Barbatos kidnapped Nephelia and Chastille Lillqvist, bringing them to his lair.
Discovering the Truth and Defeat
Barbatos found out from Nephelia that Zagan had already inherited the title of Demon Lord. Out of anger, Barbatos tried to kill Nephelia, but Zagan arrived just in time and defeated him. Even after losing, Barbatos declared he would attack Zagan again and again. But Zagan told him, "A real Demon Lord lives freely and does as he likes." Then, a misfired summoning spell caused a demon to kneel before Zagan, proving Zagan's true power. Barbatos accepted his complete defeat.
Returning to Old Friendship
After losing, Barbatos goes back to being Zagan's friend—making sassy comments, but never actually fighting him again. Zagan asks Barbatos to protect Chastille, whose clumsy side means Barbatos has to help her with mundane tasks, not just fighting.
Barbatos is the main character in the spinoff, "I Can't Leave My Useless Knight Friend Alone, So How Should I Take Care of Her?"
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