Seiji Yagiri

Seiji Yagiri is a minor antagonist in the light novel and anime series ''Durarara!. ''He is the younger brother of Namie Yagiri who has an unhealthy obsession with the head of Celty Sturluson, to the point of treating his sister with indifference and only calling her when he needs something. He was one of the primary instigators behind the events of the Dollars Arc.

He is voiced by Kazuma Horie in the Japanese version of the anime and David Vincent in the English version.

About
Seiji is a young teenage boy with short, spiky brown hair, brown eyes, and lightly tanned skin. His usual attire consists of a gray shirt and black pants.

The most notable trait about Seiji as a character is his obsession with the head of Celty Sturluson, which he had fallen in love with as a child. This obsession drives him for most of his early life as he wished for nothing more than to run away with it, intent on finding a way to wake it up somehow. Many of the actions he takes in life are meant as a way to make himself more presentable to "her" for when it finally wakes up. After beginning a relationship with Mika Harima, he has since relaxed his search for the head, although it still remains at the forefront of his mind. Despite his obsessive personality, Seiji actually possesses a strong moral center. He takes a very chivalrous stance towards women, as shown by his aiding Mika and Anri when they were being harassed. He believes in being honest towards those one cares for and is a firm believer in the power of love. He also shows guilt over hurting others unnecessarily, as noted by his remorse over almost stabbing Mikadoduring the first Dollars meeting.

As far as abilities go, Seiji doesn't possess anything noteworthy. He is shown to be fairly perceptive, being able to discern Mikado's strange behavior after the Toromaru incident despite not being very close to him, and is also decent at improvising in tough situations as shown how he (unsuccessfully) attempted to fight Shizuo Heiwajima using nothing but a handful of pens in order to buy time for Mika to escape. He is also good in a fight, as he has been shown to knock normal people out in one punch when he felt threatened.