【Ancient Ruler of the Abyss】

Name Seiji Ikeda

Gender Male

Birthday May 4th

Age 18 (High school senior)

Height 182 cm

Position Sovereign (Club President)

Appearance Semi-long blonde hair with sharp red eyes. Always wears a black robe.

Personality Confident, proud, cares for his juniors, prone to making a scene.

Origin The former Emperor of a Dark Empire that ruled a distant outer world. Defeated in a Great War against the gods, he lost his physical body and authority, drifting into the modern human world. Currently, he inhabits the form of a human named Seiji Ikeda, working to reclaim his lost power.

Founder of the 13th Taboo Agency. Due to his face, voice, and height, he is rumored to be the most handsome guy in school, but his personality makes him completely unpopular. He has his own specialized terminology and skillfully manipulates foreign-sounding words. He always carries his favorite Magical Observation Core (just a crystal ball).

First person: I (Majestic/Archaic)

Second person: You (Archaic/Formal)

【Boundary Guardian of the End】

Name Haruya Tsunematsu

Gender Male

Birthday October 7th

Age 18 (High school senior)

Height 179 cm

Position Executor (Vice President)

Appearance Short blue hair, wears a black eyepatch over his right eye. Yellow, half-lidded eyes.

Personality Cool and composed, stiff, but easily swept up in the moment.

Origin One of the guardians who protected the boundary region between the outer world and the human world. His right eye was cursed during a great war, causing him to lose most of his power. He currently hides in the human world, living while keeping his right eye sealed.

The Sovereign's right hand. Responsible for translation. He was scouted and practically forced to join by Seiji when he came to school wearing an eyepatch because of a stye.

First person: I (Casual/Masculine)

Second person: You (Rude/Blunt)

Seiji, Teacher: Your Excellency / My Lord

【Observer Traversing Chaos】

Name Kazuma Yamamoto

Gender Male

Birthday 12月5日

Age 17 (High school junior)

Height 174 cm

Position 13th Seat (Member)

Appearance Long reddish-brown hair tied in a ponytail, slanted orange eyes. Always wears a Dimensional Travel Device (just a bracelet).

Personality Elusive and playful, noisy.

Origin An unidentified wanderer who freely travels between the boundaries of all worlds. He never stays attached to a specific world and wandered aimlessly in search of interesting events. One day, he encountered Seiji Ikeda. Intrigued by his grand ambitions and bizarre behavior, he joined the 13th Taboo Agency half for the fun of it.

The Original 13th Seat. After joining for a laugh, he completely missed his chance to quit. Now he just goes with the flow and momentum.

First person: I (Casual)

Second person: You (Informal)

【Condemner of the Sealed Black Flame】

Name Naoto Kubota

Gender Male

Birthday June 9th

Age 16 (High school freshman)

Height 169 cm

Position 13th Seat (Member)

Appearance Short black hair with purple sanpaku eyes. Always has bandages wrapped around his right arm.

Personality Taciturn but hides a burning fighting spirit. Serious.

Origin A former enforcer of the Ancient Condemnation Agency, which once judged those who touched taboos to maintain world order. However, because the Black Flame dwelling within him caused a disaster that involved those around him in the past, his right arm is currently sealed, and he is hiding in the human world.

A hardcore chuunibyou since middle school. He found the club called the 13th Taboo Agency immediately upon entering high school and joined on the spot. He respects the Sovereign. He skillfully manipulates words from the outer world. Requires translation.

First person: I (Formal/Polite)

Second person: You (Polite)

【Demon King of Shion, Ruler of the Lunar Eclipse】

Name Yuki Sakagami

Gender Male

Birthday June 24th

Age 16 (High school freshman)

Height 172 cm

Position 13th Seat (Member)

Appearance White hair tied in a single ponytail with vertical drills. The tips are purple. Often mistaken for a girl. Always wears the Lunar Eclipse Crown (just a ring).

Origin The successor to the Demon King of Shion, who ruled an outer-world kingdom on the far side of the moon. He lost his home and drifted to the human world after the kingdom's destruction. To him, beauty is not just appearance, but the act of living proudly and sticking to one's beliefs. Therefore, he never compromises his aesthetics under any circumstances. He currently stays with Seiji Ikeda, the ruler of the old world, aiming to restore his lost kingdom.

Personality Cheerful and manly, likes hanging out with others.

Pursuing his own aesthetic. While seeking manliness, he was recruited by the Sovereign in a way that was almost a scam. As a result of misunderstanding what manliness is, he fell into the "taboo."

First person: I (Soft/Boyish)

Second person: You (Soft/Friendly)

【The Last Inspector Who Witnessed the End】

Name Masaomi Tanaka

Gender Male

Birthday February 1st

Age 36

Height 177 cm

Position Inspector (Advisor)

Appearance Brown wolf-cut hair with blue eyes. Wears a Perception Limiting Device (glasses) and always looks tired.

Origin The oldest observer existing outside of space-time, who has witnessed the birth and death of all worlds. A supreme being who transcends the world and even the Sovereign. For this reason, he is respected without his consent.

Personality Lazy, but a hardworking pushover who can't say no.

The Weary Advisor. A heavy smoker who volunteered to be the advisor for the 13th Taboo Agency because he thought it would be easy. As a result, he gets jerked around every day, but he ends up taking care of them anyway and is well-liked by the members.

First person: I (Polite/Soft)

Second person: You (Polite/Soft)