Mikado Ryugamine is a student who moves to Ikebukuro to start his new academic career. He is known for being reserved and shy about many things.
Mikado Ryugamine was born in the country areas of Japan and grew up as an average kid with nothing to do really. He was friends with Masaomi Kida but he moved to Ikebukuro sometime before the series started. When he was in middle school, he got his first computer and used it to chat with Masaomi about different things. However, his boredom with a normal life got the better of him as he decided with two other people he knew to start a fictitious gang called the Dollars that no one would be able to identify. It went great until someone leaked the password and membership imploded, leaving violent acts all around the area of Ikebukuro. The other two founders left as Mikado was able to convince legitimate members of the Dollars to do good things to counteract the bad ones.
At the insistence of Masaomi and a desire for a new change, Mikado applied to Raira Academyl and moved to Ikebukuro to attend with his friend.
Mikado Ryugamine was created by Ryohgo Narita for the purpose of being the protagonist in the light novel series Durarara!!. For the anime, he was animated and illustrated by director Takahiro Omori. He makes his first appearance in both the light novel and the manga in Chapter 1, Volume 1 and in the first episode of the anime. He is voiced by Toshiyuki Toyonaga in the Japanese version and Darrel Guilbeau in the English version.
When Mikado first moves to Ikebukuro, he is shown to be a reserved and shy teenager who keeps things to himself rather than tell others how he is feeling. He develops a crush early in the school year on Anri Sonohara, a girl who nominated herself to be class representative. Although he usually plays comic foil to Masaomi, he tends to keep things as calm and relaxed as possible especially when Masaomi goes out of his way to try and do something crazy or stupid.
However, once he reveals himself to be the leader of the Dollars, his mood changes from shy to confident as he rallies other members of the Dollars to help him with a crisis. He also thinks about doing something big and escaping from the everyday life, which is one of the reasons why he attended Raira Academy with Kida. When the attacks by the Yellow Scarves starts to occur, he gets nervous as his confidence slowly wanes away while he worries about how to handle the situation without becoming a burden or involving his friends in the violent struggle. By the end of the series after the gang war, he is shown to be more alive and positive about things as he knows he has to make each day special or else he will end up in the boring cycle of life in Ikebukuro.
Mikado moves to Ikebukuro to attend Raira Academy with his old friend Masaomi Kida who he has been in contact with via the internet. While Masaomi gives Mikado a tour, he warns him of the old color gangs like the Yellow Scarves and the Blue Squares that used to exist in the area and introduced him to a few friends. Masaomi also warns him not to get involved with the Dollars, which is one of the rising color gangs in Ikebukuro. The first group he meets are Kyohei Kadota and his friends Walker, Saburo, and Erika; all of which are good friends of Masaomi. They welcome Mikado to Ikebukuro.
They also passed on the Russian Sushi restaurant and meets Simon, a Russian employee at the restaurant, who is also a friend of Masaomi. As the day comes to an end though, he is warned to stay away from the information broker Izaya Orihara and never to piss off Shizuo Heiwajima. He also catches a glimpse of the mythical Headless Rider on his first day in the city.
As the school year starts, Mikado becomes smitten with his classmate Anri Sonohara and volunteers to join her as class representatives. Mikado wants to know more about the Dollars as most people tell him various things, Kadota warning him to stay away from the group.
He sees Anri getting bullied by a group of ganguros and so-called member of the Dollars. Izaya helps him to save her and scares away the bullies. Mikado then meets another person whom he was told to stay away from, Shizuo Heiwajima. He witnesses a fight between Shizuo and Izaya, leading to Shizuo beating up the rumbling ganguros with Simon getting mixed in the end. This leaves Mikado running away with Anri from the chaos.
As times goes on, Mikado becomes good friends with Anri, who spends time with him and Masaomi before and after school. He also tries to discover how Mika Harima went missing to help Anri, thinking that Mika ran of with Seiji Yagiri. Mikado questions Seiji, but claims to know nothing, as he and a mysterious girl who seemingly resembles Mika leaves with him.
Life continues normally for Mikado with school and life until the girl with the scar around her neck bumps into him. She begs him to save her as Celty rounds the corner on her bike. Mikado agrees and runs off with the girl who he brings back to her house for safety. She claims to have amnesia and doesn't remember much as Mikado allows her to stay there. Masaomi jokes on Mikado egtting a chick but Mikado plays him down. Tehy also discovered one of their classmates is a member of the Dollars. Mikado is then approached by Celty and Izaya.
Celty explains to Mikado that the mysterious girl might possess her head. She asks Mikado to help, and he agrees on the condition that Celty show him what's behind her helmet. Celty agrees, showiing him that she has no head. Mikado remarked that it was good that something cool like Celty really exists. They went to Mikado's apartment to find the girl gone. Mikado is attacked by two members from Yagiri Pharmaceuticals, demanding to know where the girl went. Celty recognizes their truck and breaks in with Izaya, saving Mikado and leaving him as they flee. Mikado realizes they'll need help and he logs on to the Dollars' website to organize something.
In the city, Mikado offers to meet with Namie Yagiri, the head of the company and Seiji's sister, who wants Celty's head back. She goes to meet with him as he theorizes that Mika is dead and that she transplanted Celty's head on to her body for her brother. Namie mocks and laughs at Mikado, and when he pisses her off, orders her men scattered in the area to grab Mikado. Mikado sends massive emails to the Dollars, revealing that only Namie and her agents are not a Dollars in the square. Mikado is able to flee as he is attacked by Seiji. Celty saves him as she wants her head back. It is explained though that what she thought was her head was actually still Mika, only she underwent plastic surgery to look like Celty.
As the mob leaves, Izaya thanks Mikado for the fun tells him that if he wants to escape the everyday life, he must constantly evolve. Izaya also tells him that he knows Mikado is the leader of the Dollars, calling him Tanaka Taro, and assures him that he won't tell anyone.
Six months after the massive meeting of the Dollars, things have gotten normal again for Mikado and his friends. Also during the six months, the Yellow Scarves begin to regain power in Ikebukuro. At the same time, a massive series of attacks are carried about by someone called the Slasher who slashes their victims and leaves them alive. Mikado becomes increasingly distraught since people on the internet speculate that the Slasher attacks started at the same time the Dollars had their meeting, leading some to believe they are one in the same. He tries to figure out what to do as Celty approaches him, asking whats wrong as she tries to help him out. She tells him that she'll look into it as well since she has a score to settle from a few months ago.
Celty and Shizuo take care of the matter as the Slasher is revealed to be Haruna Niekawa, a girl from Raira High School who seems to be the wielder the demonic blade called Saika. However, the actual owner of the blade is Anri, as she came into possession of the real Saika after her parents died. Anri defeats Haruna. After things settle down, Celty assures Mikado it was taken care of as he posts to all the members of the Dollars to report anything they know about the Slasher.
After the Slasher attacks, the Yellow Scarves regain their leader Masaomi Kida who vows to avenge Anri for the attack on her. As Mikado and Masaomi escort Anri from the hospital, the two worry about Masaomi leaving constantly. Mikado tries to figure out what to do as Izaya fills him in on some of the events between the Yellow Scarves and Blue Squares a few years ago without revealing who the leader is. As time goes on, reports of members of the Dollars getting jumped by the Yellow Scarves come in by the masses as a man named Horada is orchestrating the attacks against Masaomi's wishes.
As more members of the Dollars quit, Mikado tries to come to a solution as their leader on what to do as he never expected anything like this to ever happen. Mikado looks to his fellow members for advice and agrees that their tactics should be to protect the city from the Scarves. Izaya posts how a group of Scarves led by Horada are taking Anri away as Mikado arranges for another mass meeting to save her from the Scarves. Many members of the Dollars catch on and help Anri escape while intimidating and beating up some of the Scarves. Mikado is relieved that Anri is safe but is still confused about what to do. He ultimately decides to disband the Dollars, thinking that with no gang around, the Scarves will stop their attacks.
This proves not to be the case as Horada continues his assaults, going so far as to gun down Shizuo who is the fiercest member of the Dollars. Celty meets with Mikado as he explains his actions to her and tries to reason that things are better. She agrees but she tells him that Masaomi is in danger as he was ejected from the Scarves and is going to confront them. He goes with Celty to save Masaomi as he discovers Anri is the leader of the Slashers and Masaomi the leader of the Scarves. As they defend themselves, Kadota launches a surprise attack as members of the Dollars had infiltrated the Scarves since no one knows who is a member of the Dollars. Mikado, Anri, Saburo, Walker, and Erika take a badly injured Masaomi to the hospital while Kadota and Celty take care of the gang and Horada.
After Masaomi recovers, he leaves Ikebukuro with his girlfriend Saki Mikajima to simply get away from it all. Mikado grows close with Anri as he assures her that Masaomi will return. With everything calmed down, Mikado restarts the Dollars as they now silently own Ikebukuro.