Jack Crimson

"...do you know Simon Ryder?"

- Jack Jack Crimson, better known as the mass murderer Jack the Ripper, is a young teenager hell-bent on killing the man who murdered his older sister, even going so far as to kill anyone associated with them. He earned the infamous moniker due to the way he kills his victims; literally ripping them apart into several pieces, and hardly recognizable.

Appearance
Jack is very young with angular features and mismatched eyes, his left eye colored purple and the right eye being red, described as having a dead look to them, compared to those of a corpse. The left side of his hair is shaven, while the right side is messy and reaches down to his chin, and has a distinguishable scar on the bridge of his nose.

He is commonly dressed in a black jacket with a hood and a sleeveless red tee, and has two necklaces. The first one is a pendant in the form of a cross, while the other has several Grimm teeth attached to it.

Personality
At first glance, Jack comes off as disarmingly friendly, enough to the point where he openly listens to people's problems and offers to help them. In reality, he is cold, ruthless, and utterly brutal. Ever since the death of his sister, he has become withdrawn from the world, and is hell-bent on avenging her by killing the one responsible for her murder. He is vengeful and spiteful, and will not listen to reason, refusing to listen to the pleas of Officer Dunkel. Even in the prologue, he demonstrates sadistic brutality, torturing a man who claimed to have information about Simon Ryder, the one responsible for the death of his sister.

The mere mention of Ryder is enough to send Jack into a bloodied rage, which becomes nearly unstoppable until everything around him is dead. He appears to be mentally unstable as well, often rambling to himself, repeating incoherent words, but he also finds solace in the corpse of his sister, which he keeps preserved in a glass coffin. He often speaks with the deceased body, saying that he is very lonely, but when Ryder is nothing less but bloody mesh, he'll finally get to see her. Given his mental state, he has either become delusional, or, as implied by Dunkel, Jack may end his own life after killing Ryder. The reason for this is due to the fact that Jack's sister was the closest he had ever gotten to a mother, as their parents had died years prior to his birth.

Jack's lust for vengeance is very great. He refuses to let anyone stand in his way, even going so far as to kill anyone that he considers to be an obstacle. Many humans and faunus have fell to his hand, a majority of them even being members of the White Fang.

History
Jack Crimson was an average boy who attended Signal, intending on becoming a Huntsman like his mother, though much to his dismay, his sister heavily objected to his decision, thinking that he was hardly ready for it. Unfortunately, whatever remnants of a happy life he might have had came to an end on his thirteenth birthday, when he discovered the mutilated, defiled corpse of his sister. When the police arrived, they found Jack cradling her dead body, crying and begging for her to wake up. He was later taken to the station for question, where he learned from Officer Dunkel, that the murderer was a man named Simon Ryder, a well-known corporate affiliate in the Schnee Dust Corporation, even having good ties with the founding family. While knowing he is the killer, his connection to the Schnee Family prevented them from doing anything publicly, and they had even been left unable to gather sufficient evidence to bring him in for questioning.

This had done more than damage Jack. The sight of his sister's corpse, and seeing the smug grin on the man's face on live television during an interview, had left behind a clear message; 'the law can't touch me.' His psychological state had been left in tatters. Any and all rational thought process he possessed was left completely skewered. His perception on the world had been utterly destroyed. He understood that, because Ryder had the power and connection, nobody could touch him.

That was why he had to do it. He was the only one who could. If no one else would touch him, he would be the one to kill him. That man robbed him of his life, he had killed his sister, the woman who was like a mother to him! How could he get off scotch free?! That was when the one known as Jack the Ripper had come into being. In a year's worth of time, trying to discover where Ryder was, as he had gone into hiding, word had spread of a young child with a silver blade slaughtering anyone who was foolish enough to stand in his way, or have some connection to Simon Ryder.

That infamous mass murderer... was a broken boy named Jack Crimson.

Trivia

 * Jack's moniker, Jack the Ripper, is the name of a real-life serial killer who terrorized London. To this day, the murder has gone unsolved.
 * Jack's birthday is the day when London first learned about the existence of Jack the Ripper, which was on August 31st, the discovery of the infamous serial killer's first known victim.
 * Much of Jack's fighting style is similar to the anime character, Akito Hyuga, from the Code Geass franchise, primarily in regards to their behavior. Akito, under the influence of his brother's Geass, would become utterly focused on destroying his enemies, bearing a manic grin, and repeat the word "Die!" Jack mirrors this, though he is slightly more vocal, even mocking his enemies.