Barry Allen (Earth-90)

"Enough! You will not do to this Earth what you did to mine."

- Barry Allen to The Monitor

Barry Patrick Allen is a meta-human speedster, known as the superhero The Flash, and a forensic scientist for the Central City Police Department. He is the last known survivor of Earth-90.

Early life
Barry was born to Henry and Nora Allen. He had a brother, Jay. Both he and Jay decided to join the CCPD, following their father's footsteps, however Barry joined the crime lab while Jay became a commander.

Becoming the Flash
While celebrating his brother's birthday with the rest of his family, Barry was summoned to the crime scene at West Ridge after the aftermath of recent bombings by the Dark Riders. Later, Barry and Julio Mendez both work in the lab, examining soil samples they took from the crime scene. Eventually, Julio begins to fall asleep and is sent home by Barry. While he's working, lightning strikes Barry's lab, dousing him with chemicals from a nearby shelf. Barry is then found by Julio on the floor, and taken to the hospital. He leaves the hospital the next morning as all the tests the doctor ran tested negative, going to Hudson Diner with Iris West. After the two get into an argument over marriage, Barry leaves back to the lab, and while there receives a call from Dr. Lawrence, who informs him that there was cell damage from Barry's accident, and not knowing what to make of it, sent the results to S.T.A.R. Labs. Barry angrily informs Julio of this and refuses to have anything to do with S.T.A.R. Labs, as one of their employees died last year in one of their experiments.

Despite this, Barry still showed up at S.T.A.R. Labs, meeting Dr. Tina McGee and learning that the employee who died was her husband, David. Barry then agreed to take the tests, and found out that after the accident, he now had super speed. With her help, Barry learned to control his ability using a Soviet-made prototype deep-sea diving suit.

Barry's brother Jay was murdered by the gang leader Nicholas Pike. With a modified masked version of the suit and captured Pike bringing him to justice. Since then Barry started calling himself the Flash and helped to bring down other criminals such as The Trickster, Captain Cold and Mirror Master.

Meeting John
At some point before December 2018, Barry Allen became John's friend, in which he wears a ring (who is implicated by Barry having some kind of ability or special power).

Devastation of Earth-90
After an intense battle, Barry was seen dragging himself towards a giant book that glowed with purple energy. Before he could reach it, it was picked up by a very imposing figure in armor named Mar Novu, also known as the Monitor. When Barry asked why he was doing this, Novu said that they had done this to themselves, and that they would now perish. He then opened the book, which began to glow, while Barry ran off to escape to another universe.

Contacting Earth-1
Attempting to breach to the Monitor's next target, Earth-1, Barry managed to open a portal through which he warned Team Arrow and Team Flash about the Book of Destiny, before closing once more.

Sometime later Barry finally succeeded and fully breached through at A.R.G.U.S. He explained that The Monitor was Mar Novu and he had destroyed his world, and he mistook John Diggle with his Earth-90 doppelgänger. Just then, the Monitor appeared on TV, so Barry joined the heroes and they set out to try to attack him. During the confrontation, Barry attempted to attack first but the Monitor made him vanish, leaving his fate unknown.

Powers

 * Meta-human physiology:  Barry gained his powers after he was strucked by lightning and crashed on a shelf of chemicals (including aluminum sulfate, glycerin, potassium nitrate, magnesium hydroxide, hydrochloric acid, sulfur, tannic acid and phosphorus), and now possesses powers of incredible speed and superhuman reflexes. This was enough to him do his duties as the Flash and to escape the destruction of his teammates at the hands of Mar Novu.
 * Accelerated healing factor: After being struck by lightning and crashing on shelves of chemicals, Barry quickly recuperated from being exposed to highly volatile and reactive chemicals, lacerations, abrasions and head trauma. When he was stabbed in the leg, Barry could continue moving as the pain and stiffness wore off extremely quickly. After cracking his ribs from being thrown off the roof of a speeding car, they were merely bruised the next day.
 * Superhuman speed: Barry can move at such vast speeds, indeterminable to the naked eye.  He discovered his speed walking his dog, Earl. He ran from Central City to Crystal Beach, a distance of 30 miles in a few seconds and even briefly ran on water. When being examined by Tina McGee, he ran 347.31MPH and broke her treadmill in the process, but, McGee stated even this was not his peak velocity. When he reached for his coffee mug too quickly, he knocked it against the wall. On the Star Labs Test Track, he surpassed 570MPH until he caused a sonic boom. He easily caught up to Pike's motorcycle gang on foot, and he was so fast they mistook him for a red ghost and civilians later perceive him as "a red blur." By the time Carl Tanner visited Central city, he received word that "the Flash" could move so fast he was nearly invisible, which was seen when he returned an officer's revolver to his holster from a hobo in a heartbeat. By rapidly circling a police star badge against his glass container, he shattered a hole in it so he could breathe. He disarmed a grenade on the ground and caught his beverage before it could hit the floor, and disarmed a woman of her shotgun before she could kill her husband. He used his speed to put up posters to advertise Paul van Duzer running for district attorney.
 * Superhuman reflexes: All Barry's electro-chemical systems are accelerated, including nerve synapses, brainwaves, and even when he is at rest. Barry's reflexes enabled him to tackle Julio Mendez before he could be shot through the window. He moved out of the way just in time to let Pike crash his motorcycle. He caught a jar of hydrazine thrown by Carl Tanner before it could hit the wall and explode, and quickly disposed of a timed explosive in a customs warehouse. He also used a roulette table to deflect Arthur Simonson's bullets from hitting him.
 * Superhuman agility: Barry could run up a fire escape without stopping at high speeds, and hang onto the roof of a speeding car.
 * Superhuman durability: Barry's muscle and bone tissue changed in order to keep pace with his superhuman speed, leaving his skin unaffected when he travels at high velocities and simultaneously increasing his physical resistance to impacts and blunt force trauma, allowing him to tank hits from the monstrously strong Carl Tanner and even being lifted into the air and choked by him. He was seemingly unfazed when Lila stabbed him in the leg with a knife, and was able to stand on his feet after being thrown from the roof of a speeding car.
 * Superhuman stamina: Barry maintains a regular breathing rate and pulse shortly after running at high speeds because his body has adapted to his superhuman movement. However, he must consume sufficient comestibles lest he will face metabolic failure. Hence, though he is superhuman he can become tired, seen when he was out of breath after outsmarting Carl Tanner. He also somehow once went three days without sleeping.
 * Superhuman dexterity: Barry's sleight of hand is profoundly increased to the point where he could organize a deck of cards in a few seconds and quickly disassemble a motorcycle. After Carl Tanner's lecture, he snagged an entire tray of hors d'oeuvres before anyone could notice him. He used his unimaginable dexterity at Arthur Simonson's rigged casino, placing a marble in a certain spot on a wheel to score in a game of roulette and setting dice on certain faces to win at a craps table. He also quickly attached a hose to a fire hydrant to put out a fire, precisely skinned and cut an apple at superhuman speed, and took apart Darrell Hennings' gun.
 * Superhuman mental processes: Barry confessed to Tina McGee that his speed also has adverse psychological and emotional effects on his brain, where his mind is "stuck on overdrive" and every time he focuses on a subject, it's similar to "opening a floodgate."
 * Aerokinesis: Barry created a whirlwind in his apartment when he attempted to clean at superhuman speeds, and later used the same technique on Pike to levitate him off the ground by circling around him.
 * Electrokinesis: Barry produces yellow electricity from his body, commonly seen when running.
 * Interdimensional travel: Barry can travel through universes, as he did this when he travels from Earth-90 to Earth-1.
 * Atmospheric interference: When Barry was attempting to breach to Earth-1 and to communicate with that Earth's Oliver and Barry, he somehow caused interference at 650 nanometers, the wavelength for infrared, turning the sky to red, accommodated by thunderclouds.

Abilities

 * Genius-level intellect/Skilled tactician: Jay Allen's birthday wish was to be as smart as his brother. He impressed Carl Tanner with his up-to-date knowledge on his technical and complex work with recombinant DNA, gene splicing, genetic reorganization and radical mutation. He cleverly used a police star badge to rapidly cut through his glass container when he was being deprived of oxygen. He trapped the mutated Tanner by wrapping chain-link fence around him.
 * Expert forensic scientist/Detective: Barry Allen works for the Central City Police Department crime lab alongside Julio Mendez. His brother, Jay Allen credited him for taking down Conway and his hijacking crew. He is also a skilled detective as he deduced Pike's gang intended to liberate their incarcerated members based on blueprints seen in their hideout. He's skilled in questioning witnesses, and located Megan Lockhart's hidden camera in his apartment.
 * Skilled engineer: Barry had the mechanical know-how to disassemble one of Pike's men's motorcycles. He is also a skilled lockpick user, as quickly he broke into Paul van Duzer's campaign headquarters.
 * Skilled deceiver: Barry can conjure convincing excuses for his absences and injuries, such as when he blamed his dog for his limp when he was really still recovering from being stabbed in the leg by Lila. Some people even doubted the Flash's existence, namely Officer Murphy. When beating a rigged casino, Barry deliberately lost at blackjack to make it look like he was not cheating.
 * Skilled archaeologist: Barry took an archaeology course in college, and gained additional knowledge while working at a museum during the summers.. However, in his junior year of college, he switched majors to police science.
 * Eidetic memory: Barry recalled the exact chemicals on the shelf he landed on when he was struck by lightning, much to Tina McGee's surprise.
 * Expert combatant: Barry usually knocks his opponents down or out with a single punch, including Scott, Arthur Simonson and Darrell Hennings. He also systematically beat down escaped prisoners after disarming them and later used tools from a craps table to beat down his associates. Barry can also improvise weapons, as he used a pipe to knock two bikers off their motorcycles. He momentarily dazed the mutated Carl Tanner with his super-speed punches. Barry fought Mar Novu alongside many other heroes on Earth-90, although he was the only one of them that survived.
 * Stealth: Despite his bright red uniform, Barry can effectively hide in the dark to avoid being seen, especially by police cruisers.
 * Intimidation: Barry instilled fear into Lila in the Central City Police Department interrogation room. Criminals initially perceived his alter ego to be a blood-red demon, and Arthur Simonson's hitman thought he was Satan.

Weaknesses

 * Hyper-metabolism: Barry's blood sugar is incredibly low after he moves at superhuman speeds, because he burns up so much energy his body demands he replaces it. Because of this, he is vulnerable to rapid dehydration, glucose deficiency and metabolic failure which requires re-oxygenation of blood and glucose absorption. After his first run, he cleared an entire refrigerator of food. Even Earl's dog food appeared edible to him. He suffered from a small seizure during his confrontation with Pike. His anxiety is also a factor in his metabolism.

Equipment

 * The Flash suit: Having decided to fight crime as the Flash, Barry donned a suit made by McGee based on the prototype suit to protect his identity. It was a red bodysuit with golden wings on both sides of his ears and golden lightning-shaped linings on his gloves and belt. A Flash logo designed by Barry himself is put on the chest. He also uses brown boots.