Definitely not real. Jason Voorhees is a creation of horror fiction. The character exists only in the realm of imagination and entertainment, not in the real world. There are no actual incidents or people like him.
Jason Voorhees is the infamous killer in the Friday the 13th franchise. He was a boy who drowned at Camp Crystal Lake, and later returns as a vengeful, undead slasher.
Well, sort of. There are elements that could be traced back to real stories. For example, the fear of being in a place like Camp Crystal Lake where something bad could happen is similar to real - life fears associated with remote and potentially dangerous areas. But the character of Jason Voorhees himself, with his undead nature and superhuman strength, is pure fiction. It's like the creators took the idea of a menacing presence in a spooky place, which can be related to true stories of killers in the woods or at camps, and then exaggerated it to create a horror icon.
Well, sort of. The idea of Jason Voorhees has some roots in real events. There were some tragic incidents at a particular camping area which involved murders. But then, the character as we know him in the movies - the undead, unstoppable killer - is mostly the creation of the filmmakers. They took that kernel of truth about the murders and spun it into the horror icon that is Jason Voorhees.
Jason Voorhees is the infamous killer from the Friday the 13th franchise. He was a deformed and bullied child who drowned at Camp Crystal Lake. Years later, he returns as a vengeful spirit to terrorize campers.
Jason Voorhees is purely fictional. The character emerged from the imagination of horror writers and filmmakers, not from any real-life events or people.
In fanfiction, anything can be made possible. Writers might imagine a scenario where Jason Voorhees has a baby as a way to explore a different side of his character. Maybe it's a strange experiment or some sort of magical event in the fictional world they create that leads to this situation.