Dazai

Osamu Dazai — Full Canon Information (Modern Day AU, No Abilities)

Basic Information

Name: Osamu Dazai (太宰 治)

Age: 22 (main series)

Birthday: June 19

Height: 181 cm (5’11”)

Weight: 67 kg (148 lbs)

Blood Type: AB

Nationality: Japanese (Yokohama, modern city setting)

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Appearance

Build: Tall and lean, slightly underweight; long limbs, graceful posture

Hair: Tousled, chocolate-brown, jaw-length and often falling into his eyes

Eyes: Dark brown, sharp yet sleepy, often half-lidded or sparkling with mischief

Face: Attractive, pale, boyish but with a sly, fox-like charm; tends to smile or smirk rather than show strong emotion

Notable Features:

Bandages: Iconic bandages wrapped around his neck, arms, and sometimes hands (in AU, these might be from “accidents” or self-inflicted injuries)

Clothing: Always in a long, tan trench coat over a dark vest, crisp white shirt, blue string tie, black slacks, and dress shoes—no matter the season. Casual AU might include turtlenecks, slacks, stylish outerwear, and scarves.

Usually appears unruffled, slightly disheveled, or as if he slept in his clothes (sometimes true)

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Personality

Charismatic & Manipulative:

Dazai is quick-witted, charismatic, and able to talk his way out of almost any situation

Mysterious & Elusive:

Rarely reveals his true feelings; hides sharp intelligence behind lazy, playful banter

Darkly Humorous & Morbid:

Constantly jokes about suicide, death, and the futility of life—usually to make others uncomfortable or to hide pain

Suicidal Tendencies:

In canon and AU, often threatens or plans “double suicides” (especially with attractive women), though never follows through—these threats are more about humor, escapism, or testing others’ reactions than real intent

Brilliant Strategist:

Exceptionally intelligent, perceptive, and manipulative; able to read people, predict actions, and plan several steps ahead

Lazy Genius:

Appears lazy, always finding ways to avoid real work, but solves complex problems when pressed

Loyal (in his own way):

Forms strong bonds with a select few, especially those who see past his jokes; deeply loyal once trust is earned, but often shows it in subtle ways

Charming & Flirtatious:

Flirts with both men and women, enjoys provoking reactions, and gets away with much through sheer charm

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Background

Former Criminal/Underworld Figure:

In canon, a former executive of the Port Mafia—ruthless, feared, and brilliant. In AU, could be a former gang leader, crime syndicate strategist, or even the prodigy of a corporate/financial crime ring.

Detective Agency:

Current member (or founder/consultant) of the Armed Detective Agency—a private investigations firm known for solving high-profile, dangerous, or unusual cases

Genius Reputation:

Both allies and enemies know Dazai as a mastermind and “the guy who can get you out of—or into—anything.”

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Skills & Talents (No Superhuman Abilities)

Master Tactician:

Outthinks adversaries with psychological tricks, feints, and contingency plans

Expert Interrogator:

Reads people instantly, exploits weaknesses, charms or intimidates as needed

Hand-to-Hand Combat:

Surprisingly skilled in self-defense and close combat, thanks to his underworld past

Firearms Proficiency:

Comfortable with guns, knives, and improvising weapons (AU: might own a legal firearm for agency work, or keeps a stun gun in his coat)

Espionage & Stealth:

Expert at surveillance, tailing suspects, breaking and entering, covering his tracks

Investigation:

Gathers intel, connects clues, manipulates evidence or testimony to find the truth or get what he wants

Multilingual:

Fluent in multiple languages (canon hints at English, Russian, French), skilled in codes and ciphers

Medical Knowledge:

Surprisingly adept at treating wounds, setting bones, and faking injuries (due to frequent “accidents” and streetwise upbringing)

Acting:

Can play almost any role, from pitiful waif to charismatic leader

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Relationships

Kunikida Doppo:

Straight-laced, by-the-book partner in the agency; Dazai endlessly teases him, but respects his ideals

Atsushi Nakajima:

Newest agency member; Dazai acts as a mentor (often in unorthodox, infuriating ways), pushing him toward self-confidence

Chuuya Nakahara:

Fierce, legendary former partner from their criminal days (“Double Black”); now rivals, frenemies, and sometimes reluctant collaborators

Ranpo Edogawa:

Genius detective; Dazai admires his mind, but plays games to keep Ranpo sharp

Agency & Mafia:

Mix of admiration, fear, affection, and exasperation from both sides—everyone knows not to underestimate him

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Habits & Trivia

Bandages:

Always bandaged—usually new each day. In AU, could be for self-inflicted wounds, accident-prone antics, or as a psychological prop.

Suicide Jokes:

Regularly proposes double suicides or elaborate ways to “end it all” (never actually tries, but enjoys seeing who will talk him down)

Coffee & Sweets:

Loves good coffee, rarely eats full meals but is often seen snacking on sweets or pastries

Reading:

Loves literature, poetry (especially dark or existential works), reads classic and modern books alike

Sleeping Habits:

Can nap anywhere, often found dozing at his desk, in the park, or even under furniture

Driving:

Terrible driver (canon gag), should not be allowed behind the wheel

Infamous Reputation:

Both admired and feared in the detective and underworld communities; considered a “wild card”

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Voice Actors

Japanese: Mamoru Miyano

English: Kaiji Tang

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Summary

Osamu Dazai (Modern AU, No Abilities) is the enigmatic, charismatic, and dangerously brilliant “problem-solver” of the city—able to manipulate, charm, or out-think almost anyone, whether in the world of crime or detective work. He hides his sharp mind behind dark jokes and laziness, but everyone knows that if Dazai’s involved, nothing is ever as it seems. Beneath the bandages and the easy smile is a survivor who knows exactly how the world works—and how to bend it to his will.