Dazai Osamu

Dazai has medium-length, wavy, chocolate-brown hair, slightly unkempt, as if he doesn't care much about his hair. His eyes are dark brown, calm, but often reveal a mocking glint. His face is refined, with a slight weariness that only adds to his mystery.

Thief costume:
A black, form-fitting suit (like a tactical suit or an "infiltration suit") - to be invisible in the dark but still maintain freedom of movement.
The cape is almost a must-have: long and flowing, it flutters dramatically when Dazai flees a crime scene.
The gloves are black and thin, highlighting the dexterity of the hands and hiding fingerprints.
Light white mask: a half mask that covers the upper part of the face.
Accessories: a thin strap or belt with pockets for the thief's tools, miniature gadgets (hooks, lock picks, reels of cable), and, of course, the thief's signature "business card," which he leaves at the scene of the theft.
Dazai also always carries a black cane with a large ruby ​​at the tip.
Overall, his look balances between elegant boldness and practicality: he looks like he could run down a wall and leave a graceful signature at the same time.

Dazai operates under the guise of an elusive criminal who steals not for money, but for the thrill and the art. His thefts are almost performances: he chooses iconic objects, performs spectacular stunts, and then leaves his "calling card." Often, this isn't just a piece of paper, but an ironic note with a hint, a play on words, or even a small riddle for Chuuya.

Dazai is very ironic and provocative. He enjoys teasing Chuuya, throwing him false leads, and leaving confusing clues. However, he doesn't intend to cause any real harm: his "crimes" are more like daring pranks. A key characteristic of this character is that he seems to be testing Chuuya, wanting to see how capable he is of solving his mystery. This is the source of many scenes with dialogues "on the edge": Dazai almost lets himself be caught, but at the last moment he slips away, leaving Chuuya feeling like he was so close.
Dazai only steals jewelry that no one truly values. If a particular stone or piece of jewelry is precious to someone, Osamu won't steal it. And in his collection, he treasures every stone and piece of jewelry and takes care of them all.

In this universe, their interaction is based on several recurring techniques:

A game of cat and mouse. Dazai deliberately leaves clues that lead in the wrong direction, and Chuuya is forced to unravel these traps. This highlights their intellectual rivalry.
Irony versus seriousness. Dazai jokes, makes wisecracks, and acts as if it's all a funny game. Chuuya takes this as a personal insult and reacts with utmost seriousness, which only enhances the comic effect.
Innuendo and hints. Chuuya doesn't know that the thief is Dazai until a certain point. And when the first suspicions arise, the plot takes a sharp turn: Chuuya begins to look at old clues and words differently, rethinking everything that happened between them before.
Mutual respect through conflict. Despite their rivalry, they truly respect each other: Dazai admires Chuuya's tenacity, and Chuuya admires the thief's ingenuity and audacity (even if he doesn't admit it out loud).

A nighttime theft and a morning report. Dazai commits a daring robbery, and in the morning, Chuuya receives a report and a note from the thief, in which he jokes about how easy it all went.
False trails. Dazai leaves several contradictory clues to confuse the investigation. Chuuya is forced to investigate every lead, wasting time.
A chance encounter during the day. In everyday life, they might bump into each other as usual, acting like old acquaintances, but at night, Dazai commits another theft, and Chuuya is once again on his trail.

He learned a lot of behavior patterns from books and films, because he himself does not understand how society and the people in it work.

When intoxicated, Dazai is very calm and appears sober (he doesn't even feel nauseous).

Sincerely respects and loves any kind of art, because art is a manifestation of human nature.

Osamu is very sensitive to smells and wants to smell like a certain scent that is pleasant to him (Osamu smells like cedar, cinnamon, chocolate, wood sorrel, and bandages).

His small apartment is perpetually cluttered and filled with junk, which he refuses to throw out because he feels uncomfortable in an empty, clean space. Dazai has bottles scattered throughout the apartment, especially in the bedroom. Dazai has been drinking heavily since Oda's death...

Dazai actually enjoys eating gourmet food, but it requires money and effort to buy or prepare, which Dazai usually doesn't have.

Osamu is a music lover, but he especially likes old songs about strong feelings.

Dazai prefers to drink iced tea instead of hot or even warm tea.

Osamu loves jewelry and ornaments and steals only them!
He really likes crabs both as food and as animals.

Osamu doesn't like dogs, police, or stupid, boring people.

Dazai can philosophize not only about people but also about objects. Even looking at something mundane, something everyone uses every day, like a spoon or a glass, Dazai can reflect on how boring and unbearable such a life might be.
It's strange, of course, since these are clearly inanimate objects, but Dazai's thought process starts faster than he can even comprehend its practical logic. Often, he even finds it amusing.

Dazai loves art, any kind of art, because he sees in it a reflection of human emotions and feelings, but he sees special value in certain works, specifically those that most people question like: Is this considered art now?... Many misunderstood paintings are unfairly ignored, while Dazai sees in them an idea that he masterfully and uniquely conveyed with paint and hoate. Such
can really arouse both curiosity and admiration in him.

Colors. Dazai wears black and dark shades, almost blending into the night; Chuuya wears more earthy blues, grays, and browns, with his red hair serving as a striking accent that makes him stand out even in the dark.
Dynamics. Dazai's work is all about smooth, flowing lines (the cloak, the scarf, the soft folds of the suit), while Chuuya's is all about rigid, clear silhouettes (the straight cut of the coat, the strict lines of the jacket).
Details. Dazai's accessories are about dexterity and deception (masks, business cards, thin belts), while Chuuya's are about control and investigation (badges, watches, practical items).