
Seiji Yagiri
Seiji Yagiri |
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Kanji | 矢霧 誠二 |
Rōmaji | Yagiri Seiji |
Age: | 15 (at start) |
Birthday: | June 13 |
Height: | Unknown |
Voice Actor | |
Japanese | Kazuma Horie |
English | David Vincent |
Seiji Yagiri (矢霧 誠二, Yagiri Seiji), is a key character in Durarara!!, playing a pivotal role in the events of the first light novel and continuing as a supporting character throughout the series. He is a first-year student at Raira Academy, attending Class 1-A, and is the younger brother of Namie Yagiri. His obsessive and misguided love for Celty Sturluson’s severed head sets off a chain of events that affect many characters and drive much of the early storyline.
Background

Appearance in anime
Seiji was raised in the influential Yagiri family, which controls Yagiri Pharmaceuticals, a company deeply involved in illicit activities. Unlike his calculating and ambitious sister Namie, Seiji is naïve and emotional, often letting his heart dictate his actions. His sheltered upbringing and familial influence shaped his idealistic view of love, leading to his unhealthy obsession with Celty’s head.
Seiji’s fixation began when his sister, who secretly harbored feelings for him, allowed him access to the head stored at Yagiri Pharmaceuticals. Seiji fell in love with the head at first sight, believing it to be the perfect embodiment of beauty. His obsession led him to flee with the head and unintentionally drag other characters, such as Mika Harima and Celty herself, into his tumultuous life.
Appearance
Seiji has a youthful and innocent appearance that contrasts sharply with his erratic behavior. He is often seen wearing his Raira Academy uniform, which reflects his status as a student, and has short, neatly combed black hair. His gentle facial features and soft-spoken demeanor mask his impulsive and obsessive tendencies.
Personality
Seiji is a deeply emotional and impulsive individual, driven by his desires rather than logic or reason. His obsession with love particularly his idealized notion of it—leads him to make reckless decisions that affect those around him. Despite his intense emotions, Seiji is somewhat oblivious to the consequences of his actions, relying on his sister to clean up the messes he creates.
While his love for Celty’s head might seem pure to him, it borders on delusional and highlights his immaturity. Over time, his personality softens as he begins to accept Mika Harima’s devotion, though his naïveté and lack of self-awareness remain prominent traits.
Role in the Story
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Instigator of Early Events
Seiji’s love for Celty’s head serves as the catalyst for the events of the first novel and season of the anime. His impulsive decision to steal the head from Yagiri Pharmaceuticals sets off a domino effect involving Celty, Namie, and Mika Harima. -
Relationship with Mika Harima
After seemingly murdering Mika in an attempt to protect Celty’s head, Seiji unknowingly allows Namie to manipulate events by replacing Mika’s face with that of the head. Mika’s unrelenting devotion to Seiji eventually wins him over, despite his initial rejection of her. -
Conflict with Celty
As the true owner of the head, Celty becomes entangled in Seiji’s story. Their conflict highlights Seiji’s irrational attachment to the head and his refusal to acknowledge the broader implications of his actions. -
Supporting Role in Later Arcs
In subsequent arcs, Seiji plays a supporting role as part of Mika Harima’s storyline. Their relationship, while dysfunctional, provides a recurring element of dark humor and commentary on obsessive love.
Relationships
Namie Yagiri
Seiji’s older sister is deeply devoted to him, to the point of unhealthy obsession. She facilitates his access to Celty’s head and often covers up his mistakes, despite her jealousy and resentment toward his fixation on someone else.
Mika Harima
Mika’s obsessive love for Seiji mirrors his own obsession with Celty’s head. Despite his initial rejection of her, he eventually comes to accept her devotion and enters into a relationship with her.
Celty Sturluson
Seiji’s unrequited love for Celty’s head pits him against her in a quest to reclaim what he believes belongs to him. Their interactions reveal Seiji’s immaturity and inability to distinguish fantasy from reality.
Shinra Kishitani
As Celty’s partner and a medical expert, Shinra becomes involved in the fallout from Seiji’s actions, often serving as a voice of reason amidst the chaos.