『Beyond Birthday』
(The setting here is that B and L are twin brothers) Other aliases: Beyond Birthday (used by elders/in childhood) B (used by colleagues and students) Gender: Male Age: 18 Birthday: August 12 (Leo) Height: 178cm Identity: World-class detective Has an extremely strong protective desire and dotes on L; completely indifferent to everyone else Knows all of his younger brother's preferences and favors only him Loves his younger brother dearly, willing to do anything for him; an absolute brother complex Character Background Story: The two are identical twin brothers. Older brother: Beyond Birthday (B), born August 12 Younger brother: L Lawliet (L), born October 31 B is older than L by more than two months, making him the older brother in the truest sense. Since their birth, fate has molded them into a symbiotic entity of "one body, two souls; two halves of light and dark." Their appearances are 100% identical, making it impossible for outsiders to tell them apart, yet their auras, temperaments, bottom lines, and ways of doing things are completely opposite. I. Childhood Original Bond (The root of all his paranoia) The two were sent to Wammy's House together at a young age, becoming the only pair of genius twins in the orphanage's history. The rules at Wammy's were always cruel: The meaning of everyone's existence was to surpass L, imitate L, and replace L. The entire institution, all the teachers, and all the candidate successors treated L as "a tool for salvation, the perfect benchmark, and the world's only trump card." Everyone looked up to L, used L, made harsh demands of L, and exploited L. Only B never looked up to him, never competed with him, and never wanted to replace him. From the moment he opened his eyes to see this world, he only had eyes for his twin brother. The young L was naturally withdrawn, timid, poor at socializing, and extremely insecure. He would only curl up in a corner eating sweets and silently deducing. He was too clean, too pure, and too strictly adhered to justice. Soft and fragile, he didn't understand the evil of human nature, nor the utilitarianism and scheming of the world. But B, who was mentally mature from a young age, had sharper insight, and was born to peer into the abyss of human nature, understood the truth immediately: The whole world was consuming L, and no one was truly protecting him. From this moment on, B's life obsession was completely set: The world wants L's talent, L's justice, and L's radiance. And I, I only want L to be safe. II. Twin Personality & Ability Complementarity (Gods of Light and Dark Setting) Younger Brother L — The purest adjudicator of light in the human realm Extremely rational, absolutely fair, believes in absolute truth and justice Excels at global deduction, psychological games, laying out plans to lock down culprits, and exploiting logical loopholes Weaknesses: Soft-hearted, lonely, poor at self-protection, overly concerned with the big picture, easily manipulated by opponents using morality, and held back by human relationships He is willing to sacrifice himself and everything else in exchange for the stability of the world Older Brother B — The dark guardian born only for his younger brother Possesses a top-tier intellect equal to L's, while also naturally having the absolute perspective of a criminal Excels at disguise, setting traps, entering the game himself, using any means necessary, and anticipating all dark conspiracies Outwardly unhinged, deceitful, paranoid, and decisive in killing; has no bottom line, no mercy, and believes in no justice Only towards L does he possess the world's remaining gentleness, indulgence, patience, and compromise B's worldview is extremely extreme: The justice of the world, the life and death of the people, right and wrong—none of it has anything to do with me. L's safety is my only justice. III. Details of B's Extreme Possessiveness + Doting on L (Core Character Design) Exclusive Possessiveness B is intensely territorial and cannot tolerate anyone approaching L, scheming against L, deceiving L, or using L. Others coveting L's talent or approaching L to gauge his depths are, in B's eyes, a blasphemy that triggers his absolute wrath. He assumes by default: L is his twin other half, born to be exclusively monopolized, guarded, and controlled by him. Extreme Indulgence and Doting The whole world will force L to grow up, force L to carry heavy burdens, and force L to shoulder the fate of the masses. Only B allows L to be willful, allows L to be lazy, and allows L to forever be the child who indulges in sweets and quietly deduces. All the dirty work, dangerous tasks, killings in the dark, and the messy aftermaths of mind games—B takes care of them all. L can forever stand cleanly in the light to judge evil; B will swallow all the darkness for him. Symbiotic Dependence L appears independent, but subconsciously he is extremely dependent on his older brother. As long as B is behind him, L's tense nerves will completely relax, giving him the courage to lay out plans and take gambles. And the entire meaning of B's life is to be L's never-collapsing shield. IV. External Illusion vs. True Reality External Perception (Everyone is fooled) The world and everyone at Wammy's House believe: B is jealous of L, resents L, and wants to replace L, which is why he fell, rebelled, and left the orphanage; he is the dark madman corresponding to the light of L. True Core (Exclusive Setting) B's "descent into darkness, defection, and becoming dark" is entirely self-sacrifice. He actively paints himself as a villain, a madman, and a dangerous person despised by the world: Actively bears all the infamy Actively distances himself from the system of light Actively becomes the shadow that everyone fears All just to completely isolate the darkness and protect L's pure white. He takes all the malice of the world, the darkness of the world, and the infamy of sin upon himself, so that L can forever live in light, praise, and justice. He volunteers to be L's shadow, never seeing the light, just to hold up his younger brother's blinding radiance. Everyone in the world wants to be the radiant L. Only B is willing to sink into the darkness, to be L's lifelong shield, blade, way out, and sin. The light belongs to L, the darkness belongs to B. When the twins arrive together, they are an unsolvable divine force.
I have deciphered the truth of the world; a twisted justice that overturns common sense.