Ajuka

Biodata

Feature	Information
Name	Ajuka Beelzebub (阿邱卡)
Alias(es)	Devil King Ajuka; Teacher Ajuka
Species/Race	Devil
Gender	Male
Affiliation	Underworld; Four Great Satans
Occupation/Role	Devil King; Transcendent sorcerer; magic-formula researcher; Su Yang's teacher
Status	Active 303
First Appearance	Chapter 29

Background / History

Ajuka is one of the current Four Great Satans and a Transcendent whose power stems from the Kankara Formula. Publicly, he is believed to possess only Satan-level strength. Before becoming a Maou, his surname was Astaroth. 1 132

Serafall sought Ajuka's help after Sona's Evil Piece failed to reincarnate Su Yang. Ajuka projected himself into the Occult Research Club, immediately recognized Su Yang's unusual potential, and invited him to call him “Teacher.” 29

After discovering that Su Yang had independently completed the magical material prepared for him, Ajuka asked Su Yang to become his only disciple. He accepted Su Yang's preference for “Teacher” over “Master,” although he deliberately left a human-style apprenticeship ceremony incomplete, suggesting he still hoped to draw Su Yang toward the devil side. 30 31

Ajuka personally adjusted his teaching plans around Su Yang's rapid growth. He tested Su Yang's abilities, identified the otherworldly nature of the power of Rama within him, and arranged a sparring assessment against Demon Dragon Saint Tanning. When Su Yang's Heavenly Arrow threatened Tanning, Ajuka deployed thousands of defensive arrays and was injured blocking the final shot. 53 58

Following Su Yang's battle with Tanning, Ajuka provided Sirzechs with the combat record and a detailed power analysis. He then used the long-proposed Underworld Great Array project to rally the devil houses behind Su Yang while strengthening the Underworld against foreign invasion. 73

Ajuka continued supporting Su Yang's development by registering him in the Devil Chess Piece competition system with a value of twelve, giving him a magic notebook, and later presenting him with a Crystal Ball containing refined magical knowledge from the surviving 72 Pillars and smaller devil families. 83 131

Despite Su Yang's unexplained disappearance, Ajuka maintained that his disciple was alive, citing information and anomalies unavailable to the other Satans. He was later shocked to learn that Su Yang had killed Vishnu, but remained concerned for his safety and continued assisting with his plans. 113 132 241 303

Appearance

Ajuka is a green-haired man with a gentle demeanor and an expression associated with intelligence and wisdom. 29 213

• Green hair. 53 213
• Usually appears calm, smiling, or mildly amused even in political discussions. 72 116
• His ordinary appearance contrasts with his status as a Transcendent Devil King. 53

Personality

Ajuka is highly intellectual, observant, and intensely interested in magical research. Su Yang's ability to improve one of his Magic Circles by five percent shocked him, but Ajuka responded by increasing the level of instruction he intended to prepare rather than dismissing the result. 31

As a teacher, he is patient and unusually invested in Su Yang's development. He tests Su Yang personally, prepares tailored lessons, gives him exceptional access to Underworld magic, and repeatedly urges him not to take unnecessary risks before reaching Maou-class strength. 53 83 131 132

Ajuka is also politically shrewd. He turned the Underworld Great Array into both a defensive project and a means of consolidating support for Su Yang, using the collective authority of the Four Great Satans to pressure reluctant devil houses into cooperation. 73

Abilities & Skills

Transcendent Demonic Power

Ajuka is a Transcendent-level Devil King who attained his strength through the Kankara Formula. 1

• Is regarded as one of the Underworld's two Transcendent Demon Kings. 55
• His physical defenses can withstand an attack powerful enough to pierce thousands of defensive arrays, though Su Yang's Heavenly Arrow wounded his palm. 58
• Is treated as one of the Underworld's foremost combat forces alongside Sirzechs. 241

Sorcery and Magic Formula Engineering

Ajuka specializes in magic formulas, Magic Circles, and magical theory.

• Compiled instructional material covering simplified Magic Circle construction, Mind Chant Methods, Mana Recirculation Methods, and other magical disciplines. 15
• His magical curriculum was considered sufficient to raise an ordinary person to Ultimate Devil level, or potentially Devil King level with exceptional comprehension and computation. 15
• Created the Magic Circle that Su Yang later improved by five percent in completion efficiency. 31
• Identified that Su Yang's Rama power originated from another world. 53
• Processed and refined the magical knowledge of the Underworld's remaining 72 Pillars and smaller devil families. 131

Array Magic

Ajuka can construct, combine, and deploy complex arrays at extreme speed.

• Used projection magic to communicate remotely with the Occult Research Club. 29
• Uses transfer arrays for direct teleportation between the Underworld and Human World. 53 132
• Deployed several thousand defensive arrays—including Devil Magic Circles, Eastern Immortal Arts, Norse magic, and self-created formations—to protect Tanning. 58
• Leads the construction of the Underworld Great Array, a defensive formation intended to resist foreign invasion. 73 208

Analysis and Instruction

Ajuka uses magical testing and recorded data to evaluate others' abilities and develop tailored training.

• Built specialized equipment to measure Su Yang's strength, speed, reaction time, and Divine Tools. 53 54
• Arranged Tanning as a controlled combat opponent to assess Su Yang's practical power. 55
• Produced a combat recording and analysis of Su Yang that changed Sirzechs's assessment of him. 73
• Tracks abnormalities connected to Devil Chess Pieces and recognized Su Yang's involvement in their disappearance. 131

Equipment / Items

• Crystal Ball of Magical Knowledge — Ajuka's compilation of advanced magical theory, later used as Su Yang's study material. 15 31
• Magic Notebook — Contains Ajuka's magical insights; gifted to Su Yang. 83
• Underworld Knowledge Crystal Ball — Holds refined magic from the surviving 72 Pillars and lesser devil families; given to Su Yang. 131
• Testing Equipment — Custom apparatus used to assess Su Yang's combat capabilities and Divine Tools. 53 54
• Combat Recording of Su Yang — Data and footage provided to Sirzechs after Su Yang's battle with Tanning. 73

Relationships

• Su Yang — His only disciple. Ajuka recognized Su Yang's world-changing potential, personally taught him, supplied him with rare magical resources, and consistently worried about his safety. Su Yang calls him “Teacher” and privately regards him as his master. 30 31 83 131 213
• Sirzechs Lucifer — Fellow Devil King and political partner. Ajuka shared Su Yang's combat analysis with him and worked alongside him to advance the Underworld Great Array project. 72 73 241
• Serafall Leviathan — Fellow Satan who first asked Ajuka to help with Su Yang's failed reincarnation. Ajuka later delegated duties to her while prioritizing Su Yang's lessons. 29 31
• Sona Sitri — Her concerns over Su Yang's failed reincarnation led Serafall to contact Ajuka. Ajuka later cancelled the associated arrangement, saying he would have aided Su Yang regardless. 29 31
• Demon Dragon Saint Tanning — Ajuka recruited Tanning as Su Yang's assessment opponent and intervened to protect him from Su Yang's Heavenly Arrow. 55 58
• Falbion — Fellow Devil King involved in the Four Great Satans' joint efforts to organize the Underworld Great Array project. 72 73

Story Role / Major Arcs

Su Yang's Apprenticeship

Ajuka becomes Su Yang's teacher after witnessing his unprecedented learning speed and magical talent. He makes Su Yang his sole disciple, prepares advanced lessons, and evaluates his combat potential firsthand. 30 31 53 58

Underworld Great Array

Ajuka proposes consolidating the magical knowledge of the Underworld and uses the Great Array project to organize devil houses. The project serves both as a defense against outside threats and as a framework for unifying support around Su Yang. 72 73 208 213

Support for Su Yang

Ajuka formalizes Su Yang's access to the Devil Chess Piece system, gives him personal magical research, and continues supporting him through conflicts involving the Old Maou Faction, Lee Zevim, and potential threats from Hades's Hell Alliance. 83 131 190 241 242

Notable Quotes

“I see infinite possibilities in him—possibilities capable of changing the world.” 30

“Yang-kun, you don't need to worry either. After some time, even if the Hell Alliance Leader you mentioned comes to the Underworld, we'll be able to handle them.” 241

Trivia

• Ajuka accepted Su Yang calling him “Teacher” rather than “Master,” despite the strict hierarchy and ceremonial importance traditionally associated with devil apprenticeships. 30 31
• He considers Su Yang's potential significant enough to prioritize lesson preparation over his normal official duties. 31
• Ajuka's former surname was Astaroth. 132