Barry Allen (Earth-1)

Dr. Barry Allen is a intern for the Central City Police Department's forensics department. He is a big fan of The Arrow.

Early life
When Barry was eleven years old, he saw a tornado-like blur sweep through his house, in the middle of which he could see a figure, and by the time it reached him, he was swept twenty blocks away from his house. He soon discovered that his mother was murdered and that his father was framed for it, having been incarcerated with a life sentence. Knowing it was certainly not his father's fault, it caused him to begin looking into cases with impossible circumstances, in hopes of one day proving that he is not insane and did infact tell the truth.

Visit to Starling City
Years later, Barry arrived in Starling City. He wasn't able to initially get a cab as the driver pulled away, and he soon arrived at Queen Consolidated's applied sciences division to investigate a mysterious break-in, where he met Oliver Queen, John Diggle, Quentin Lance and Felicity Smoak (the latter whom he had an instant connection with).

He set himself up in the division with Felicity's help. The two began talking, and Barry began speculating about The Arrow and his background, making incisive observations about why the Arrow wore green, the type of arrows he used, and how he had partners, particularly someone who had a background in computer science, unnerving Felicity.

He was astounded when Felicity asked him to help with a blood sample from an arrow she received from the police with "connections" from Oliver. His cover as an intern working for the police was blown by Oliver while he was watching a news report about the mass particle accelerator. He explained to them that he investigated mysterious cases in hopes of solving his mother's murder, then he left. Later on, he was called by Oliver to come to his home where he was throwing a party for his mother where he apologized to Felicity while they danced.

Barry was contacted by his boss and was told to return to Central City if he hoped to keep his job, but after missing the train he waited in the train station where he was hit with a tranquilizer dart to the neck. When he awoke, he found himself in Oliver's base with Diggle watching him and Oliver lying on a table in full vigilante costume. Felicity approached him and asked Barry to save Oliver's life who was not only poisoned with tainted blood, but also had been beaten by the robber who had stolen from Queen Consolidated and a blood bank.

Personality
Barry is described as someone who compliment's Felicity Smoak's intellect level when it comes to forensics as she claims its not her strong suit. He also someone who is always late as he missed a cab and missed the train back to Central City. He is also considered a comic geek

Much like Oliver, he has a sense of justice as he knows his father is innocent in a crime he is serving a life sentence and joins the forensic department in order to use his fascination with understanding the unexplained crimes in the world like with his father's case.

Trivia

 * He tends to be late for everything, a homage to the fact that in the comics Barry would be late for everything to keep his identity as The Flash a secret, though in the Arrow universe it's just because he's unlucky.
 * He knows a lot about the actions of the vigilante and tells Felicity several ways in which The Arrow can improve his chances. He also tends to think that The Arrow must have trained in a tropical environment because of his green clothing, because black would be a much better color of stealth.
 * Barry is the eleventh person to discover Oliver's secret identity, which he discovered in.
 * The original comic-version of Barry Allen has blond hair where as the Barry Allen in the Arrow universe has dark brown hair.

Behind the scenes

 * In the DC multiverse Barry Allen is the second person to take up the superhero mantle of The Flash.
 * In 2014, The Flash will be the third DC-owned character to have its own television broadcasted show on The CW, following Smallville Arrow.