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Izaya Orihara (折原 臨也)Age: 23 (claims to be 21 forever) / 25 (as of volume 9)
Birthday: May 4
Height: 175 cm
Weight: 58 kg
Blood type: O
Job: Information dealer
Weapon: Switchblade pocket knife
Hobby: Human observation
Dislikes: Shizuo Heiwajima, eyes of dead fish, his twin kid sisters.
Favorite food: Any food that tells him something about the personality of the one who prepared it
Disliked food: Canned food, compressed food, junk food, etc.
Favorite quote: "It is absurd to divide people into good and bad. People are either charming or tedious." —Oscar Wilde, Lady Windermere's Fan
Internet names: Nakura (to fool girls),
A young man who sells information for his own enjoyment. He claims to love the entire human race except for Shizuo Heiwajima, and exhibits said love by putting humans in often miserable conditions and observing their reactions.
He attended Raira Academy with Shizuo, Shinra and Kadota. According to Shinra, Izaya and Shizuo hated each other with a passion almost from the point they met. In the novels Izaya framed Shizuo for crimes on several occasions. In the anime he puts Shizuo in constant problems, such as gangs attacking him daily up to framing him of crimes.
He is a master of parkour, and also quite skilled with his flickblade (the blade he uses must be slightly opened before the mechanics of it springs opens the blade—a switchblade will open on its own after the user presses a switch) as he is implied to be the only one capable of leaving numerous cuts in Shizuo's bartender suit after a fight in the novels. In the anime, he shaves a gang member's head bald without him noticing it. He is also fluent in Russian, which is exhibited in the final episode and episode 13 when he speaks with Simon.
Izaya has two younger sisters, Mairu and Kururi, who are twins and troublemakers. He claims to have grown up in a normal family whose only abnormal trait was their naming habits. He does not like his sisters and finds them to be unlovable, saying that if even he can not like them, he expects no one else to ever be able to either.
His name comes from a combination of the biblical Isaiah and Japanese for "the one who looks over the crowd."
In the novels, Shinra is the only person that Izaya doesn't consider as one of his "humans." Rather, Izaya considers Shinra as his only friend (which is rather rare).