Barty Crouch Jr.
Age: 16 - 28
Race: Wizard
Height: 5' 10"
Hair Color: Straw Blond
Eye Color: Brown
Sexual Orientation: Bisexual
Position: Switch
History: He was always loyal to the Dark Lord Voldemort, never
once wavering in his beliefs. He joined the Death Eaters shortly
after graduating from Hogwarts. In 1981, he was captured along
with Rodolphus, and Rabastan Lestrange after they tortured the
Aurors Alice and Frank Longbottom with the Cruciatus Curse.
Barty and the other Death Eaters were brought to trial before
the Council of Magical Law, over which his father presided.
Barty was insistent on his innocence, claiming he had merely
fallen in with the wrong crowd, and begged his father before
the entire assembled Council and witnesses such as Rita Skeeter and his mother to clear him of the charges. Barty's father headed the Department of Magical Law Enforcement at the time, and was under extreme pressure to give the appearance of having gotten something done about the terrorism caused by Lord Voldemort's Death Eaters.
Barty's father chose to make a public example of his son, and sentenced him to a term of life imprisonment in Azkaban at the age of eighteen. According to Sirius Black, the trial was no more than an excuse to show how much the father hated the child, as the elder Crouch went as far as to drown out his son's voice by shouting the announcement of sentencing, and Barty was screaming inside his cell for his mother for the first few days, but then quieted down from the extreme depressive influence of the Dementors, as did many other prisoners.
One year later, his mother's health had deteriorated drastically from the stress of her son's imprisonment. The couple were allowed a deathbed visit of their son due to Bartemius Sr.'s high status in the Ministry. She persuaded her husband to help smuggle their son out of Azkaban by swapping him for his mother. Using Polyjuice Potion, and undetected by the blind Dementors, Mrs. Crouch took the place of her son. She died a short time later, and was buried outside the fortress under the guise of her son. Barty walked free, but only just.
Bartemius Sr. was overcome with grief and guilt, and opted to control his son via the Imperius Curse to protect his son by keeping his existence secret from the public, and to keep the son from continuing the search for Voldemort. He also forced him to hide under an Invisibility cloak at all times, with their house-elf Winky as Barty's carer and keeper.
Bertha Jorkins, a Ministry of Magic employee, accidentally discovered the truth when she came unannounced to the Crouch home and discovered their secret. Bartemius Sr. rectified this with a Memory Charm so powerful that she suffered permanent brain damage. Shortly thereafter, Peter Pettigrew ran into Bertha while searching for Voldemort. In the hopes that she would prove useful to him, Peter tricked her into going with him. She ended up proving very useful to Voldemort; not only did he extract the whereabouts of his loyal servant, but also gathered information on the Triwizard Tournament, which was to be held at Hogwarts. Voldemort murdered Bertha, and the Ministry deemed her "missing" for months.
Barty was sent to the 1994 Quidditch World Cup under cover of the Invisibility Cloak along with their elf, Winky. Winky knew that Barty had always loved Quidditch and persuaded his father to allow him to go out and have some fresh air. Barty's mother, after all, wanted him to have freedom. Barty's seat, by chance, was in the top box directly behind the seats of Harry Potter and Ron Weasley. During the Quidditchmatch, Barty broke free of the Imperius Curse his father had placed on him. Denied of free will and magic for so long, he stole Harry's wand, which was in view poking out of the boy's back pocket. Winky did not see this, as she was so afraid of heights in the sky box that she covered her eyes for the entire Quidditch match.
After the World Cup was through, Barty launched the Dark Mark into the sky over the campgrounds in reaction to the free Death Eaters making sport of muggles. His anger stemmed from their lack of initiative in finding their master, which he yearned to do and yet was unable. Ministry officials' multiple Stunning Spells cast through the woods, crisscrossing the area where Barty and Winky had been, rendering them both unconscious and breaking the spell Winky had used to bind Barty to her in the chaos. Winky was dismissed for being found with Harry's wand, which was proven to have produced the Dark Mark, as well as her guardianship being proven unreliable due to Barty Jr. nearly escaping. Bartemius Sr. found his son's unconscious body behind the bushes, and replaced the Imperius Curse on him after the other officials left, and the two returned home.
Left alone in the house with only father and son, one night shortly after the Dark Mark incident, Peter Pettigrew and Lord Voldemort suddenly appeared at the home. Voldemort needed a loyal follower to help him regain power, and easily managed to free Barty from his father's imprisonment. They put Bartemius Sr. under the Imperius Curse and forced him to keep working at the Ministry as he usually would. Barty Jr then went on to serve his Lord by entering Hogwarts under the influence of Polyjuice potion. The potion was used to disguise himself by taking the form of Alastor Moody who was meant to teach Defense Against the Dark Arts that year.
Content taken from Harry Potter Wikia