Leonard Snart

Leonard Snart, also known as Captain Cold, is the leader of the Rogues, making him an enemy of the Flash.

Early Life
Leonard Snart experienced a rough childhood. His mother died when he was a child, forcing him and his younger sister Lisa to be raised alone by their father, who had not taken his wife's death well and resorted to alcoholism and physical abuse. Leonard's only refuge, was when his nurturing grandfather would sometimes invite Leonard and his sister to visit him at the ice factory where he worked; Leonard grew up to cherish the cold atmosphere as a symbol of his escape from abuse.

Into adulthood, Leonard, a bright mind, decided to pursue a life of crime and thievery. Though Lisa was an ice skating prodigy, Leonard's protective attitude and Lisa's appreciative acceptance lead her to give up her dream and instead follow her brother down a darker path.

S.T.A.R. Labs Heist
After robbing a bank of its money, the Rogues are in their warehouse planning their next heist. Leonard informs the team that they are going to hit a S.T.A.R. Labs Convoy next in order to steal the tech onboard, which is rumoured to be worth millions on the black market. Hours later, at night, they commit the plan to detail and the Rogues grab as many cases of tech as possible. Mick Rory opens one to reveal an experimental flamethrower but Leonard reminds him they're here to pay off their debt not collect weapons for personal use.

Choosing their weapons
After robbing the S.T.A.R. Labs convoy, the Rogues regroup in their warehouse. Leonard instantly goes towards planning their next job, but Mick Rory grabs the flamethrower and starts messing around with it. Leonard casually tells him to put it down, per usual he has to control Mick from going too far, but instead of complying Rory just turns it on and starts bursting flames in the air, roaring with laughter. Leonard scolds him as he's trying to concentrate but Lisa tells him to calm down as they got the job done. Mick reminds him the tech is supposed to pay off their debt but why not kill the people trying to blackmail them. Leonard thinks of the idea and picks up what appears to be a gun. He shoots it at some metal which instantly freezes and crumbles into pieces of ice. He stares in awe as its cold air reminds him of his childhood and he takes the gun back to his desk, claiming it to be his.

Central City Fine Jewellery Heist
The Rogues decide to rob a jewellery store with their new weapons and so by the time the Flash arrives, the floor was covered in golden ice as well as most of the store being empty. The 4 rogues are at the back of the store while The Flash blocks the entrance. The Flash tries taking them on but Leonard creates a wall of ice stopping Barry in his tracks, allowing Harkness to throw an explosive boomerang at the speedster, throwing him out of the building in incredible pain. Before the Flash can regain his balance, the Rogues were already gone.

Second fight with the Flash
The Rogues were planning their next heist before they noticed the Flash had come close to their perimeter. Leonard tells the Rogues to get ready and by the time the Flash entered the warehouse, they were already ready for him. He tries taking them on one at a time but they had each others backs and so the Flash couldn't get close. He was hit by their weapons again and again, damaging his suit and causing him to nearly fall unconscious. Leonard stood above a barely conscious Flash ready to finish him off but the speedster ran away before he could do so.

Central City Casino Heist
The 4 Rogues decide to rob the Casino the next day and it's going fine until the Flash enters the building to stop them. Mick and Lisa try stop the Flash while Leonard and Harkness collect the money but he uses their tools against each other before taking them out using his super speed. Leonard tells Harkness to buy him some time and so he does so but is easily knocked out. However, Leonard had already ran away with the money but Flash easily caught up to him. The Flash tries to convince Leonard to hand himself in so they can help the Rogues overcome the people blackmailing them but Leonard tells the speedster he has no idea who they're trying to deal with. The Flash asks who they are but Leonard thinks nothing of it and instead tries taking on the speedster. The Flash easily knocks the rogue unconscious and ties him up with the rest. The publicity of the event due to the Flash's public debut resulted in "Captain Cold", "Heatwave", "Golden Glider" and "Captain Boomerang" being the Rogues' publicly used nicknames for media references, especially by Iris West since she's the one who came up with them in her original article on them which quickly blew up.

Abilities

 * Genius Level Intellect
 * Leadership: He is the leader of the Rogues and even managed to convince Lisa Snart to join him as a criminal and ditch her career which she was a prodigy at.
 * Mechanical Engineering: Snart is capable of fabricating a weaponized cold-engine. He stole the original engine and its plans and spent days taking it apart and putting it back together again until he could do it with his eyes closed.
 * Tactical Analysis: He also has a very tactical mind, and his own personal sense of honor.
 * Expert Combatant
 * Marksmanship
 * Thievery

Equipment

 * Cold Gun: Captain Cold's standard weapon is a gun that slows the atoms of the target to a halt, causing them to not simply become extremely cold but freeze near dead in their tracks while in motion, rather than actually shooting ice and freezing the target directly. It was originally made by S.T.A.R. Labs before being modified by Leonard Snart to the point he could take it apart and put it together with his eyes closed.