Spring-Heeled Jack

Early Life
Spring-Heeled Jack was born in London to two doctors. Due to spending lots of time with them at work and seeing them patch up hundreds of attempted murder victims, he became annoyed at the inefficiency of the serial killers of the city, until he found out about his idol, Jack the Ripper. Seeing his example, Jack decided to follow Jack, and so Jack became a serial killer.

Weaponry
In order for Jack to be as good as Jack at killing, he knew he would need tools. He created a homemade crude flamethrower in his basement and tested it out by incinerating his parents. He also created a pair of metal claws to use in up close combat.

Early Attempts
Jack's first attempts at being a serial killer were mostly unsuccessful, on account of his victims running away. To counter this, he created boots with springs that would allow him to jump double his height straight into the air. This allowed him to chase after his victims as well as outrun police horses and outrace bullets. Through his tactics he was able to kill dozens of victims across London.

Demons
Due to his rising notoriety and body count, a demon approached Jack with a deal. The Demon had wanted to ally themselves with Jack the Ripper, but had suffered a mortal wound from the Ripper. The Demon had planned to turn their body into a mask to keep themselves alive, and regrow by drinking the blood of those who Jack had killed. In return, the mask would grant him abilities that would let him surpass even Jack the Ripper.

The Mask
The Mask he received had the ability to either kill or instill insanity upon anyone who gazed upon it, depending on their character. Using it, Jack was able to instantly kill any police or prospective detectives who would come for him. His kills quickly racked up to the low thousands within one month.

Jack the Ripper
Through his murders, Jack gained the attention of Jack the Ripper. Though excited to see his idol, Ripper saw Spring Heeled Jack as a sloppy imitation of himself and sought to destroy it. The two had a short fight, but The Ripper was immune to the effects of the mask due to his character, and killed Jack with relative ease, though crediting him as the only actual resistance he had ever felt from one of his victims.

Fate of the mask
His mask was later retrieved by police using death row inmates, but it was revealed the mask left behind on his body was a fake. The mask eventually ended up in a museum, and was eventually stolen during a massive heist, and ended up in Ten Beard's Vault.