Seitarou Yagiri

Seitarou Yagiri is a major antagonist in the second season of the anime ''Durarara!!. He was a minor character in the first season and a former Yagiri Pharmaceuticals worker. ''He is known to be Namie and Seiji's uncle. He is later revealed to be partnered with Jinnai Yodogiri but is actually working with Kasane Kujiragi.

Appearance
In season one on his debut, his face wasn't shown but he wore a white lab coat and had shiny silver hair.

In season two, he has brown hair just like his nephew and niece. He wears a dark brown business suit as well with a red tie. It is shown he also wears a monocle on his right eye. His face is well rounded and has bits of wrinkles making him slightly older than middle age.

Dollars / Mika Harima Arc
Seitarou was the first one to show Namie the head of Celty. He did not have a very important character role that time. It was found in Ireland.

Adabashi Arc
Seitarou demands that Shingen will give him Celty's head which Shingen refuses. He threatened him by telling him he will go after his son, Shinra in a flashback. This made Shingen to give the head to Seitarou. He later mentioned to stay away from Jinnai Yodogiri.

Kadota's Coma Arc
Namie encounters both Seitarou and Kasane Kujiragi. They both ask Namie to come with them silently which Namie refuses. Kujiragi paralyzes her and replied that they will also kidnap Seiji too to get Namie to cooperate. Namie continued to resist and Kujiragi tazed her to make her stop.