Victor Zsasz (Earth-4678)

Victor Zsasz was born into a life of luxury and wealth until he lost his grip on reality after the tragic deaths of his parents at a young age and the loss of what remained of his inheritance money after a night of ill-fated gambling at the Iceberg Lounge. Believing all life to be meaningless and worthless, Zsasz takes it upon himself to murder as many people as he can in order to cure them of life, seeing them as nothing more than zombies stuck in an endless loop of misery. Carving a tally mark into his skin after every murder as proof of his work, the only concern in Zsasz's life is body count and the number of marks on his body.

Source

 * https://batman.fandom.com/wiki/Victor_Zsasz_(Arkhamverse)