Ran Izumii is a character in Durarara!!. He was the former leader of the Blue Squares, until he was thrown in jail for kidnapping Saki and breaking her legs. He is also the older brother of Aoba Kuronuma.
In the past, Ran was always jealous of his little brother due to the fact that Aoba always recieved more attention from his parents than he did. Ran would frequently pick on him to vent and quickly fell into the wrong crowd at school, even taking up smoking. After Ran went a little too far with picking on Aoba, his brother set his room on fire, which his parents blamed on Ran's smoking. A few years later, after their parents divorced and Aoba went to live with their mother, Aoba called on Ran once again to ask for a favor. Aoba told Ran about a gang he made, the Blue Squares, that was quickly getting too large to control since there were adults who started joining up. Ran knew Aoba was trying to use him as a figure head but agreed to take over as leader since he thought he would be able to surpass Aoba somehow. Not long after, Izumii got into a fight with another gang called the Yellow Scarves and started to lose when Masaomi Kida started going to Izaya Orihara for help. Ran and his gang eventually decided to kidnap Saki Mikajima, Masaomi's girlfriend, to lure him into a trap but were thwarted by Kadota and his gang, who betrayed Ran and saved Saki. Ran and most of the Blue Squares were arrested after the incident.
A few years later, Ran is finally released from jail and gets an invitation to meet Izaya Orihara at his office. Izumii accepts and meets Izaya along with several others whom he doesn't recognize. Izumii states that he is there to get revenge on all the people responsible for putting him in prison. The people topping the list are: Aoba, Masaomi, Kadota and his group, along with Izaya himself. However, Ran states that he is willing to work with Izaya if it will get him to the other people on his list.
Yellow Turban ArcEdit
He gets arrested ofr kidnapping Saki.
Dragon Zombie ArcEdit
He participates in the rescue of Izaya after he gets kidnapped by Amphisbaena and Heaven's Slave. He telephones the leaders of the groups, "Earthworm" and Shijima, and claims to be the real Izaya and that the person they captured was a fake. Earthworm unties and unmasks the person they have on the chair to reveal...Izaya. Izumii, along with Mikage Sharaku and several members of the gang, Dragon Zombie, bust through the door and incapacitate Earthworm's and Shijima's subordinates. Earthworm attacks with two broken bottles but Ran easily defeats her; Ran then proceeds to attempt to rape her but is stopped by Mikage, who is against violation of women. Ran stops but says that Mikage owes him a favor and leaves, seeing that he was no longer needed.
Kadota's Coma ArcEdit
Ran finally begins his plan for revenge, and kicks it off by attacking Kyohei when he was seperated from his gang. The attack was so severe, it puts Kyohei into a coma and places him in critical condition at the hospital. Ran also confronts Aoba at some point in the novel, but he spares him for some reason (likely because he has something else planned for him later).Ran's actions invoke the anger of Kyohei's friends, particularly Walker , who start a manhunt for him throughout the city. Ran manages to trick Walker and Masaomi into fighting each other and, after a few minutes of watching them go at it, he enters the fight himself and focuses mainly on Walker. The two engage in a fierce struggle, which ultimately ends in Ran getting burned even more than he already was and getting forced to retreat.