Leonard Snart

Leonard Snart, nicknamed Captain Cold by Cisco Ramon, is a criminal in Central City.

History
Leonard tried to hijack a delivery truck carrying the Kahndaq dynasty diamond, though he and his crew were stopped by the Red Streak. Leonard later had the janitor and S.T.A.R. Labs too steal the cold gun.

Leonard then took the tour of the Central City museum twice though Dexter Myles was quickly suspicious of him. Leonard moved onto a theater where he would give Barry a "test run" where Barry successfully saved everyone except a security guard. On the same night, Leonard would successfully steal the diamond but was confronted by Barry. Leonard used the cold gun to derail the train so he could escape as Barry was saving the passengers. When Leonard had a clear shot of Barry, Cisco Ramon, Caitlin Snow, and Felicity Smoak arrived with the "Prototype cold gun" which was actually the S.T.A.R. Labs vacuum cleaner to threaten him to leave. As he does, he would be asked to drop the diamond though he would refuse. Leonard confronts Mick, an old accomplice of his, asking if he would like to join forces again as he presents him with the fire-based gun he was previously offered when he first took the cold gun.

Personality
Leonard is a ruthless man who exudes a calm and chilling disposition, seldom ever losing his temper or giving into emotions. Although he never finished high school, he is intelligent and patient, staking out a job for months before making his move, emphasizing timing, precision, and minimizing possible leads on him and his activities by refusing to kill unless necessary. He was also clever enough to deduce that what stopped his job at the armored car was in fact a man, and that he would need a weapon to halt Barry, choosing the cold gun for this very reason. Snart has however begun to revel in his new-found weapon's power, and his battles with The Flash have begun to alter his perceptions of how the job works.

Abilities

 * Expert thief: Over the years of criminal experience, Leonard has mastered the art of thieving, from armored car heists, jewel theft and bank robbery, he displays the utmost skill.
 * Skilled Tactician/Planner: Leonard is highly intelligent, planning every detail of his heists, down to the last second. He also possessed enough cunning to upgrade his methods, knowing he could not defeat The Flash on his own, without help. His skill was so high, he was able to defeat Barry Allen twice, despite being just a normal human.
 * Skilled marksman: Leonard has the skill to hit The Flash with a blast from his freeze pistol, despite the former moving at superhuman speed. 

Equipment

 * Cold Gun: Can generate a beam of absolute zero temperature, freezing whatever it touches and creating solid objects of ice. It can also slow down the motion of the Flash's molecules, retarding his accelerated healing and vastly reducing his speed. It also gives off bright white flashes.
 * Goggles: Captain Cold also wears a pair of blue wraparound goggles, which are designed to protect his eyes from the flashes given off by his cold gun.

Trivia

 * In comparison with some of his comic book portrayals, this version of Leonard Snart is more serious, and a genuine threat to Barry Allen's life.
 * In the episode Going Rogue, Snart wears a blue parka along with his goggles towards the end of the episode. This is a reference to his costume in the DC comics.